bug#31532: Non-capitalized CC in rmail.texi(emacs-26)

[Takesi Ayanokoji]

In Emacs-26 manual(rmail.texi), some @code{CC} fixed to@{CC}.

But in rmail.texi, there still remain non-capitalized CC.

rmail.texi:756:@samp{Subject}, @samp{To}, @samp{CC}, @samp{In-reply-to} and

rmail.texi:759:sent the message you received, and the @samp{CC} field starts out with

rmail.texi:766:excluded from the @samp{CC} field.  They are also excluded from the

rmail.texi:773:This omits the @samp{CC} field completely for a particular reply.

rmail.texi:942:against the @samp{To}, @samp{From}, and @samp{CC} headers (supply a prefix

rmail.texi:943:argument to exclude the @samp{CC} header).

Thanks.

ayatakesi <ayanokoji.takesi@gmail.com>