Merge branch '4417-stale-hyperlinks-in-the-arm' into 'main'

Fix stale hyperlinks in the ARM

Closes #4417

See merge request isc-projects/bind9!8525

doc/dnssec-guide/introduction.rst

@@ -372,7 +372,7 @@ want to consider deploying DNSSEC:
 .. [#]
    The Office of Management and Budget (OMB) for the US government
    published `a memo in
-   2008 <https://www.whitehouse.gov/sites/whitehouse.gov/files/omb/memoranda/2008/m08-23.pdf>`__,
+   2008 <https://georgewbush-whitehouse.archives.gov/omb/memoranda/fy2008/m08-23.pdf>`__,
    requesting all ``.gov`` subdomains to be DNSSEC-signed by December
    2009. This explains why ``.gov`` is the most-deployed DNSSEC domain
    currently, with `around 90% of subdomains

doc/dnssec-guide/validation.rst

@@ -706,7 +706,7 @@ database (``managed-keys.bind.jnl``) as the source of key information.
 
 Explicit management of keys was common in the early days of DNSSEC, when
 neither the root zone nor many top-level domains were signed. Since
-then, `over 90% <https://stats.research.icann.org/dns/tld_report/>`__ of
+then, `over 90% <https://ithi.research.icann.org/graph-m7.html>`__ of
 the top-level domains have been signed, including all the largest ones.
 Unless you have a particular need to manage keys yourself, it is best to
 use the BIND defaults and let the software manage the root key.