Merge pull request boostorg#92 from rdoeffinger/spellingfix

Minor spelling fix.

Author: jzmaddock

include/boost/regex/v4/regex_traits_defaults.hpp

@@ -141,7 +141,7 @@ inline bool is_separator<char>(char c)
 BOOST_REGEX_DECL std::string BOOST_REGEX_CALL lookup_default_collate_name(const std::string& name);
 
 //
-// get the state_id of a character clasification, the individual
+// get the state_id of a character classification, the individual
 // traits classes then transform that state_id into a bitmask:
 //
 template <class charT>