value should be a regular expression; any recipients that match are
excluded from the @samp{CC} field. They are also excluded from the
@samp{To} field, unless this would leave the field empty. If this
-variable is nil, then the first time you compose a reply it is
+variable is @code{nil}, then the first time you compose a reply it is
initialized to a default value that matches your own address.
To omit the @samp{CC} field completely for a particular reply, enter
use for the summary window. The variable
@code{rmail-summary-line-count-flag} controls whether the summary line
for a message should include the line count of the message. Setting
-this option to nil might speed up the generation of summaries.
+this option to @code{nil} might speed up the generation of summaries.
@node Rmail Summary Edit
@subsection Editing in Summaries