update URL to the marc.info mail archive

The name marc.theaimsgroup.com is no longer active, and has
migrated to marc.info.

Signed-off-by: Ondřej Bílka <neleai@seznam.cz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/user-manual.txt

@@ -4669,5 +4669,5 @@ Write a chapter on using plumbing and writing scripts.
 Alternates, clone -reference, etc.
 
 More on recovery from repository corruption.  See:
-	http://marc.theaimsgroup.com/?l=git&m=117263864820799&w=2
-	http://marc.theaimsgroup.com/?l=git&m=117147855503798&w=2
+	http://marc.info/?l=git&m=117263864820799&w=2
+	http://marc.info/?l=git&m=117147855503798&w=2

builtin/apply.c

@@ -473,7 +473,7 @@ static char *find_name_gnu(const char *line, const char *def, int p_value)
 
 	/*
 	 * Proposed "new-style" GNU patch/diff format; see
-	 * http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
+	 * http://marc.info/?l=git&m=112927316408690&w=2
 	 */
 	if (unquote_c_style(&name, line, NULL)) {
 		strbuf_release(&name);

t/t6021-merge-criss-cross.sh

@@ -3,7 +3,7 @@
 # Copyright (c) 2005 Fredrik Kuivinen
 #
 
-# See http://marc.theaimsgroup.com/?l=git&m=111463358500362&w=2 for a
+# See http://marc.info/?l=git&m=111463358500362&w=2 for a
 # nice description of what this is about.