Issue #21593: (from StackOverflow) minor doc clarification for re.search.

Doc/library/re.rst

@@ -527,7 +527,7 @@ form.
 
 .. function:: search(pattern, string, flags=0)
 
-   Scan through *string* looking for a location where the regular expression
+   Scan through *string* looking for the first location where the regular expression
    *pattern* produces a match, and return a corresponding :class:`MatchObject`
    instance. Return ``None`` if no position in the string matches the pattern; note
    that this is different from finding a zero-length match at some point in the