Lai Jiangshan bc98e9fbc2 str: fix comments for FromStr for bool
Fix the return type in the comments.

An old commit 082bfde41217 ("Fallout of std::str stabilization") removed
the example of FromStr::from_str(), this commit adds it back. But
the example of StrExt::parse() is still kept with an additinal note.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
2015-03-03 13:34:11 +08:00
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