[patch] std::string doxygen docs and other comments

[Jonathan Wakely]

This patch fixes a few minor typos in some comments and corrects the
doxygen docs for basic_string::find_first_of and related functions.
These have a number of copy'n'paste errors such as documenting
defaults on overloads without any default arguments, and find_last_of
claiming to find the first matching position not the last.

OK for mainline? And the 4.2 branch after 4.2.2 is released?

Jon
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