Checked lispref/tips.texi

Checked lispref/tips.texi

* doc/lispref/tips.texi: Copyedits.
(Coding Conventions): Mention autoloads.
Combine partially duplicated macro items.  Fix xref.
Refer to Library Headers for copyright notice.
(Programming Tips): edit-options is long-obsolete.
(Compilation Tips): Mention loading bytecomp for byte-compile props.
(Warning Tips): Mention declare-function.
(Documentation Tips): Remove old info.
(Comment Tips): Mention comment-dwim, not indent-for-comment.
(Library Headers): General update.

* admin/FOR-RELEASE: Related markup.