Fix the grammar in the isprint(3) description.
Fix the grammar in the isprint(3) description.

PR:		140456
Submitted by:	Jeremy Huddleston <jeremyhu@apple.com>

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase