Harmonise doc strings for {re-,posix-,}search-{forward,backward}

The doc strings for re-search-forward and re-search-backward have been
improved (bug#25193, bug#31584) but the corresponding posix- and
non-regexp search functions still have the original text, despite
describing the exact same mechanism.

There is no reason for them to differ, so we make them all use the
updated version which also is more readable.  Any future doc string
improvements should be made to all of them in the same way for
consistency.

* src/search.c (Fsearch_backward, Fsearch_forward)
(Fposix_search_backward, Fposix_search_forward):
Use text from Fre_search_forward and Fre_search_backward.

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