Small edits for programs.texi in Emacs manual
* doc/emacs/programs.texi (Programs, Electric C): Copyedits. (Program Modes): Add xref to Fortran. (Left Margin Paren): Remove what was (oddly enough) the only use of defvar in the entire Emacs manual. (Hungry Delete): Remove footnote about ancient Emacs version. (Other C Commands): Use example rather than smallexample.
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