More regexp advice and clarifications
* doc/lispref/searching.texi (Regexp Special): Simplify style advice for order of ], ^, and - in character alternatives. Stick with saying that it’s not a good idea to put ‘-’ after a range. Remove the special case about raw 8-bit bytes and unibyte characters, as this documentation is confusing and seems to be incorrect in some cases. Say that z-a is the preferred style for reversed ranges, since it’s clearer and is typically what’s used in practice. Mention some bad styles: duplicates in character alternatives, ranges that denote <=3 characters, and ‘-’ as the first character.
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