Fixed errors in docs:

unsigned int changed to match_flag_type in several places,
plus occurance of std rather than boost.


[SVN r22160]

libs/regex

@@ -1 +1 @@
-Subproject commit c9efbea4a713d3ad73ef946b78868adee89352e8
+Subproject commit 9ebe515adf1ad819b7602d674ffcb37f99251526