git.c: consistently use the term "builtin" instead of "internal command"

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/technical/api-builtin.txt

@@ -14,7 +14,7 @@ Git:
 
 . Add the external declaration for the function to `builtin.h`.
 
-. Add the command to `commands[]` table in `handle_internal_command()`,
+. Add the command to `commands[]` table in `handle_builtin()`,
   defined in `git.c`.  The entry should look like:
 
 	{ "foo", cmd_foo, <options> },

git.c

@@ -332,7 +332,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 	return 0;
 }
 
-static void handle_internal_command(int argc, const char **argv)
+static void handle_builtin(int argc, const char **argv)
 {
 	const char *cmd = argv[0];
 	static struct cmd_struct commands[] = {
@@ -517,8 +517,8 @@ static int run_argv(int *argcp, const char ***argv)
 	int done_alias = 0;
 
 	while (1) {
-		/* See if it's an internal command */
-		handle_internal_command(*argcp, *argv);
+		/* See if it's a builtin */
+		handle_builtin(*argcp, *argv);
 
 		/* .. then try the external ones */
 		execv_dashed_external(*argv);
@@ -563,14 +563,14 @@ int main(int argc, char **av)
 	 *  - cannot execute it externally (since it would just do
 	 *    the same thing over again)
 	 *
-	 * So we just directly call the internal command handler, and
-	 * die if that one cannot handle it.
+	 * So we just directly call the builtin handler, and die if
+	 * that one cannot handle it.
 	 */
 	if (starts_with(cmd, "git-")) {
 		cmd += 4;
 		argv[0] = cmd;
-		handle_internal_command(argc, argv);
-		die("cannot handle %s internally", cmd);
+		handle_builtin(argc, argv);
+		die("cannot handle %s as a builtin", cmd);
 	}
 
 	/* Look for flags.. */