wcpcpy and wcslen need better standards details

I've taken to providing richer standards conformance details. So for wcslen/wcsnlen it should look like below. (This gives users a better clue as to how to access the definition(s).)

STANDARDS wcslen() The wcslen() function is available in the following compilation environments. See standards(5).

 o   ISO/IEC 9899/AMD1:1995 (``ISO C90, Amendment 1'')
 o   ISO/IEC 9899:1999 (``ISO C99'')
 o   ISO/IEC 9899:2011 (``ISO C11'')
 o   X/Open Portability Guide Issue 4 (``XPG4'')
 o   X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'')
 o   Version 2 of the Single UNIX Specification (``SUSv2'')
 o   Version 3 of the Single UNIX Specification (``SUSv3'')
 o   IEEE Std 1003.1-2008 (``POSIX.1'')

wcsnlen() The wcsnlen() function is available in the following compilation environment. See standards(5).

 o   IEEE Std 1003.1-2008 (``POSIX.1'')

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