add isblank(3); call things functions consistently, don't list the

add isblank(3); call things functions consistently, don't list the
rest of the world in the SEE ALSO section

SCCS-vsn: lib/libc/locale/ctype.3 6.6
SCCS-vsn: lib/libc/locale/isalnum.3 5.3
SCCS-vsn: lib/libc/locale/isalpha.3 5.3
SCCS-vsn: lib/libc/locale/isascii.3 5.2
SCCS-vsn: lib/libc/locale/iscntrl.3 5.3
SCCS-vsn: lib/libc/locale/isdigit.3 5.3
SCCS-vsn: lib/libc/locale/isgraph.3 5.3
SCCS-vsn: lib/libc/locale/islower.3 5.3
SCCS-vsn: lib/libc/locale/isprint.3 5.3
SCCS-vsn: lib/libc/locale/ispunct.3 5.3
SCCS-vsn: lib/libc/locale/isspace.3 5.4
SCCS-vsn: lib/libc/locale/isupper.3 5.3
SCCS-vsn: lib/libc/locale/isxdigit.3 5.3