Fix a typo.

* win32/win32.c: wrok -> work

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61851 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/win32.c

@@ -7969,7 +7969,7 @@ w32_io_info(VALUE *file, w32_io_info_t *st)
 	    CloseHandle(f);
 	    return INVALID_HANDLE_VALUE;
 	}
-	/* this API may not wrok at files on non Microsoft SMB
+	/* this API may not work at files on non Microsoft SMB
 	 * server, fallback to old API then. */
 	if (GetFileInformationByHandle(f, &st->info.bhfi)) {
 	    st->file_id_p = FALSE;