Fix minor typo

This commit was SVN r22497.

opal/config/opal_configure_options.m4

@@ -424,7 +424,7 @@ AM_CONDITIONAL([OPAL_WANT_SCRIPT_WRAPPER_COMPILERS], [test "$enable_script_wrapp
 #
 AC_ARG_ENABLE([per-user-config-files],
    [AC_HELP_STRING([--enable-per-user-config-files],
-      [Disable per-user configuration files, to save disk accesses during job strart-up.  This is likely desirable for large jobs.  Note that this can also be acheived by environment variables at run-time.  (default: enabled)])])
+      [Disable per-user configuration files, to save disk accesses during job start-up.  This is likely desirable for large jobs.  Note that this can also be acheived by environment variables at run-time.  (default: enabled)])])
 if test "$enable_per_user_config_files" = "no" ; then
   result=0
 else