* libs/libc/stdlib/lib_strtod.c:
(strtod): Add a note about limitations of this implementation
as compared to POSIX in the function's docstring. Also fix a
typo.
* libs/libc/stdlib/lib_strtof.c:
(strtof): Port the changes made to strtod in PR-6952 (commit
c83985c5ce7) and add same note as above to docstring.
* libs/libc/stdlib/lib_strtold.c:
(strtold): Same changes as strtof.