Alternative formatting on freebsd/developer/* blocks

Use angle brackets instead of italic to denote mandatory fields after
"freebsd/developer/" blocks. "freefall name" and "NickServ name" are
also renamed to "freefall username"` and "FreeNode account".

Reviewed by:	debdrup, ygy, lwhsu
Approved by:	philip (mentor)
Differential Revision:	https://reviews.freebsd.org/D29285

documentation/content/en/articles/committers-guide/_index.adoc

@@ -3250,8 +3250,8 @@ FreeBSD committers can get a free 4-CD or DVD set at conferences from http://www
 [[benefits-irc]]
 === IRC
 
-In addition, developers may request a cloaked hostmask for their account on the Freenode IRC network in the form of `freebsd/developer/``_freefall name_` or `freebsd/developer/``_NickServ name_`.
-To request a cloak, send an email to `{irc-email}` with your requested hostmask and NickServ account name.
+In addition, developers may request a cloaked hostmask for their account on the Freenode IRC network in the form of `freebsd/developer/<freefall username>` or `freebsd/developer/<FreeNode account>`.
+To request a cloak, send an email to `{irc-email}` with your requested hostmask and NickServ account name. See the https://wiki.freebsd.org/IRC/Cloaks[IRC Cloaks] wiki page for more details.
 
 [[benefits-gandi]]
 === `Gandi.net`