Fix changelog formatting for #4579

doc/changelog/changelog-9.18.30.rst

@@ -31,10 +31,20 @@ Feature Changes
   This adds the command line arguments: `-d` (debug), `-l` (list tests)
   and `-t test` (run this test) to the unit tests.
 
-  e.g.  ```     % ./rdata_test -t zonemd     [==========] selected:
-  Running 1 test(s).     [ RUN      ] zonemd     [       OK ] zonemd
-  [==========] selected: 1 test(s) run.     [  PASSED  ] 1 test(s).
-  %  ``` :gl:`#4579` :gl:`!9386`
+  e.g.
+
+  .. code::
+
+     % ./rdata_test -t zonemd
+     [==========] selected:
+     Running 1 test(s).
+     [ RUN      ] zonemd
+     [       OK ] zonemd
+     [==========] selected: 1 test(s) run.
+     [  PASSED  ] 1 test(s).
+     %
+
+  :gl:`#4579` :gl:`!9386`
 
 - Process also the ISC_R_CANCELED result code in rpz_rewrite()
   ``26df9f6255b``