[entries] Add list of allowed HTML tags in subjects to FAQ 72?

FAQ #72 explains which HTML tags are allowed in entries.

Perhaps it could be expanded to show which of them are allowed in entry subjects? As I understand it, the list is <a> <b> <i> <u> <em> <strong> <cite>. (This is the content of @$subject_allow in cleanhtml.pl.)

For example, replace

Comments allow all of the tags shown above except form tags such as <form> and <input>.

with

Comments allow all of the tags shown above except form tags such as <form> and <input>. The subjects of journal entries allow only the tags <a> <b> <i> <u> <em> <strong> <cite>.