* doc/emacs/files.texi (Visiting): Don't enclose an entire form
within @var, use @code for the whole form and @var for
individual variables within instead.
* doc/lispref/commands.texi (Key Sequence Input): @xref must be
followed by either , or ..
* doc/lispref/processes.texi (Filter Functions): Introduce
punctuation absent from the last sentence of a paragraph.
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