More updates to Programs chapter of Emacs manual.
* doc/emacs/programs.texi (Comment Commands): Fix description of for M-; on blank lines. Move documentation of comment-region here. (Multi-Line Comments): Clarify the role of comment-multi-line. Refer to Comment Commands for comment-region doc. (Options for Comments): Refer to Multi-Line Comments for comment-multi-line doc, instead of duplicating it. Fix default values of comment-padding and comment-start-skip.
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