Update syntax of some options so they are better displayed in Docs

src/mod_admin_extra.erl

@@ -1605,7 +1605,7 @@ mod_doc() ->
 	      "administrator changes their password again. It is possible to "
 	      "define the reason of the ban. The new password also includes "
 	      "the reason and the date and time of the ban. See an example below."),
-           ?T("- 'pushroster' (and 'pushroster-all'):"),
+           ?T("- 'pushroster': (and 'pushroster-all')"),
            ?T("The roster file must be placed, if using Windows, on the "
 	      "directory where you installed ejabberd: "
 	      "C:/Program Files/ejabberd or similar. If you use other "

src/mod_multicast.erl

@@ -1188,19 +1188,19 @@ mod_doc() ->
 	      desc =>
 		  [?T("Specify a list of custom limits which override the "
 		      "default ones defined in XEP-0033. Limits are defined "
-		      "per sender type and stanza type, where:"),
-		   ?T("- The sender type can be: 'local' or 'remote'."), "",
-		   ?T("- The stanza type can be: 'message' or 'presence'."), "",
-		   ?T("- The number can be a positive integer or the key word 'infinite'.")],
+		      "per sender type and stanza type, where:"), "",
+		   ?T("- 'sender' can be: 'local' or 'remote'."),
+		   ?T("- 'stanza' can be: 'message' or 'presence'."),
+		   ?T("- 'number' can be a positive integer or 'infinite'.")],
               example =>
-                  [{?T("Default values:"),
-                    ["local:",
+                    ["# Default values:",
+                     "local:",
 		     "  message: 100",
 		     "  presence: 100",
 		     "remote:",
 		     "  message: 20",
-		     "  presence: 20"]}
-		  ]}},
+		     "  presence: 20"]
+		  }},
            {name,
             #{desc => ?T("Service name to provide in the Info query to the "
 			 "Service Discovery. Default is '\"Multicast\"'.")}},

src/mod_pubsub.erl

@@ -4303,17 +4303,17 @@ mod_doc() ->
 	    #{value => "List of Key:Value",
 	      desc =>
 		  ?T("This allows to define a list of key-value to choose "
-		     "defined node plugins on given PEP namespace."),
+		     "defined node plugins on given PEP namespace. "
+		     "The following example will use 'node_tune' instead of "
+		     "'node_pep' for every PEP node with the tune namespace:"),
 	      example =>
-		  [{?T("The following example will use 'node_tune' instead of "
-		       "'node_pep' for every PEP node with the tune namespace:"),
 		    ["modules:",
 		     "  ...",
 		     "  mod_pubsub:",
 		     "    pep_mapping:",
 		     "      http://jabber.org/protocol/tune: tune",
 		     "  ..."]
-		   }]}},
+		   }},
 	   {plugins,
 	    #{value => "[Plugin, ...]",
 	      desc => [?T("To specify which pubsub node plugins to use. "