Remove extra space from die func output (#3391)

src/main.c

@@ -118,7 +118,7 @@ static void usage(int code, int keep_it_short) {
 
 static void die(void) {
   fprintf(stderr, "Use jq --help for help with command-line options,\n");
-  fprintf(stderr, "or see the jq manpage, or online docs  at https://jqlang.org\n");
+  fprintf(stderr, "or see the jq manpage, or online docs at https://jqlang.org\n");
   exit(2);
 }