Denote all command line options using semantic markup (.. option::)

The markup allows referencing individual options, and also makes them
more legible (no more thin red text on gray background).

Most of the work was done using regexes:
    s/^``-\(.*\)``$/.. option:: -\1\r/
    s/^``+\(.*\)``$/.. option:: +\1\r/
on bin/**/*.rst files along with visual inspection and hand-edits,
mostly for positional arguments.

Regex for rndc.rst:
    s/^``\(.*\)``/.. option:: \1\r/
+ hand edits to remove extra asterisk and whitespace here and there.

bin/dnssec/dnssec-settime.rst

@@ -59,7 +59,8 @@ purposes.
 Options
 ~~~~~~~
 
-``-f``
+.. option:: -f
+
    This option forces an update of an old-format key with no metadata fields. Without
    this option, ``dnssec-settime`` fails when attempting to update a
    legacy key. With this option, the key is recreated in the new
@@ -68,10 +69,12 @@ Options
    specified, then the key's publication and activation dates are also
    set to the present time.
 
-``-K directory``
+.. option:: -K directory
+
    This option sets the directory in which the key files are to reside.
 
-``-L ttl``
+.. option:: -L ttl
+
    This option sets the default TTL to use for this key when it is converted into a
    DNSKEY RR. This is the TTL used when the key is imported into a zone,
    unless there was already a DNSKEY RRset in
@@ -80,16 +83,20 @@ Options
    defaults to the SOA TTL. Setting the default TTL to ``0`` or ``none``
    removes it from the key.
 
-``-h``
+.. option:: -h
+
    This option emits a usage message and exits.
 
-``-V``
+.. option:: -V
+
    This option prints version information.
 
-``-v level``
+.. option:: -v level
+
    This option sets the debugging level.
 
-``-E engine``
+.. option:: -E engine
+
    This option specifies the cryptographic hardware to use, when applicable.
 
    When BIND 9 is built with OpenSSL, this needs to be set to the OpenSSL
@@ -108,47 +115,57 @@ months (defined as 30 24-hour days), weeks, days, hours, or minutes,
 respectively. Without a suffix, the offset is computed in seconds. To
 explicitly prevent a date from being set, use ``none`` or ``never``.
 
-``-P date/offset``
+.. option:: -P date/offset
+
    This option sets the date on which a key is to be published to the zone. After
    that date, the key is included in the zone but is not used
    to sign it.
 
-``-P ds date/offset``
+.. option:: -P ds date/offset
+
    This option sets the date on which DS records that match this key have been
    seen in the parent zone.
 
-``-P sync date/offset``
+.. option:: -P sync date/offset
+
    This option sets the date on which CDS and CDNSKEY records that match this key
    are to be published to the zone.
 
-``-A date/offset``
+.. option:: -A date/offset
+
    This option sets the date on which the key is to be activated. After that date,
    the key is included in the zone and used to sign it. 
 
-``-R date/offset``
+.. option:: -R date/offset
+
    This option sets the date on which the key is to be revoked. After that date, the
    key is flagged as revoked. It is included in the zone and
    is used to sign it.
 
-``-I date/offset``
+.. option:: -I date/offset
+
    This option sets the date on which the key is to be retired. After that date, the
    key is still included in the zone, but it is not used to
    sign it.
 
-``-D date/offset``
+.. option:: -D date/offset
+
    This option sets the date on which the key is to be deleted. After that date, the
    key is no longer included in the zone. (However, it may remain in the key
    repository.)
 
-``-D ds date/offset``
+.. option:: -D ds date/offset
+
    This option sets the date on which the DS records that match this key have
    been seen removed from the parent zone.
 
-``-D sync date/offset``
+.. option:: -D sync date/offset
+
    This option sets the date on which the CDS and CDNSKEY records that match this
    key are to be deleted.
 
-``-S predecessor key``
+.. option:: -S predecessor key
+
    This option selects a key for which the key being modified is an explicit
    successor. The name, algorithm, size, and type of the predecessor key
    must exactly match those of the key being modified. The activation
@@ -156,7 +173,8 @@ explicitly prevent a date from being set, use ``none`` or ``never``.
    predecessor. The publication date is set to the activation date
    minus the prepublication interval, which defaults to 30 days.
 
-``-i interval``
+.. option:: -i interval
+
    This option sets the prepublication interval for a key. If set, then the
    publication and activation dates must be separated by at least this
    much time. If the activation date is specified but the publication
@@ -183,22 +201,28 @@ purpose, but should never be used in production.
 
 Known key states are HIDDEN, RUMOURED, OMNIPRESENT, and UNRETENTIVE.
 
-``-s``
+.. option:: -s
+
    This option indicates that when setting key timing data, the state file should also be updated.
 
-``-g state``
+.. option:: -g state
+
    This option sets the goal state for this key. Must be HIDDEN or OMNIPRESENT.
 
-``-d state date/offset``
+.. option:: -d state date/offset
+
    This option sets the DS state for this key as of the specified date, offset from the current date.
 
-``-k state date/offset``
+.. option:: -k state date/offset
+
    This option sets the DNSKEY state for this key as of the specified date, offset from the current date.
 
-``-r state date/offset``
+.. option:: -r state date/offset
+
    This option sets the RRSIG (KSK) state for this key as of the specified date, offset from the current date.
 
-``-z state date/offset``
+.. option:: -z state date/offset
+
    This option sets the RRSIG (ZSK) state for this key as of the specified date, offset from the current date.
 
 Printing Options
@@ -207,10 +231,12 @@ Printing Options
 ``dnssec-settime`` can also be used to print the timing metadata
 associated with a key.
 
-``-u``
+.. option:: -u
+
    This option indicates that times should be printed in Unix epoch format.
 
-``-p C/P/Pds/Psync/A/R/I/D/Dds/Dsync/all``
+.. option:: -p C/P/Pds/Psync/A/R/I/D/Dds/Dsync/all
+
    This option prints a specific metadata value or set of metadata values.
    The ``-p`` option may be followed by one or more of the following letters or
    strings to indicate which value or values to print: ``C`` for the