Fix grammar

PC/w9xpopen.c

@@ -19,9 +19,9 @@
 #include <stdio.h>
 
 const char *usage =
-"This program is used by Python's os.popen function to\n"
+"This program is used by Python's os.popen function\n"
 "to work around a limitation in Windows 95/98.  It is\n"
-"not designed to be used as stand-alone program.";
+"not designed to be used as a stand-alone program.";
 
 int main(int argc, char *argv[])
 {