Clarify what happens to match data on failure
Problem reported by Ernesto Alfonso (Bug#21279). * doc/lispref/searching.texi (Regexp Search, Simple Match Data): Document more carefully what happens to match data after a failed search. * src/search.c (Fmatch_beginning, Fmatch_end): Document that the return value is undefined if the last search failed. (Fmatch_data): Simplify doc string line 1.
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