[docs] [issue21593] Clarify re.search documentation first match

[Roundup Robot]

Roundup Robot added the comment:

New changeset 48bb48e7499d by Berker Peksag in branch '3.5':
Issue #21593: Clarify that re.search() returns the first match
https://hg.python.org/cpython/rev/48bb48e7499d

New changeset 243b95782059 by Berker Peksag in branch 'default':
Issue #21593: Merge from 3.5
https://hg.python.org/cpython/rev/243b95782059

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