Adapt man page styling for recent website CSS changes

(cherry picked from commit affcfca)

Author: michaelklishin

Makefile

@@ -279,8 +279,8 @@ web-manpages: $(WEB_MANPAGES)
 	    gsub(/<\/h2>/, "</h3>", line); \
 	    gsub(/<h1/, "<h2", line); \
 	    gsub(/<\/h1>/, "</h2>", line); \
-	    gsub(/class="D1"/, "class=\"D1 sourcecode bash hljs\"", line); \
-	    gsub(/class="Bd Bd-indent"/, "class=\"Bd Bd-indent sourcecode bash hljs\"", line); \
+	    gsub(/class="D1"/, "class=\"D1 lang-bash\"", line); \
+	    gsub(/class="Bd Bd-indent"/, "class=\"Bd Bd-indent lang-bash\"", line); \
 	    print line; \
 	  } } \
 	  ' > "$@"

docs/rabbitmq-plugins.8

@@ -82,7 +82,7 @@ To learn more, see the
 .Bl -tag -width Ds
 .It Fl n Ar node
 Default node is
-.Qq Pf rabbit@ Ar target-hostname ,
+.Qq Ar rabbit@target-hostname ,
 where
 .Ar target-hostname
 is the local host.

docs/rabbitmqctl.8

@@ -57,7 +57,7 @@ and
 .Bl -tag -width Ds
 .It Fl n Ar node
 Default node is
-.Qq Pf rabbit@ Ar target-hostname ,
+.Qq Ar rabbit@target-hostname ,
 where
 .Ar target-hostname
 is the local host.