Change from using email.com to example.com as example domain, as per RFC 2606.

Signed-off-by: David Symonds <dsymonds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/SubmittingPatches

@@ -10,7 +10,7 @@ Checklist (and a short version for the impatient):
 	- the first line of the commit message should be a short
 	  description and should skip the full stop
 	- if you want your work included in git.git, add a
-	  "Signed-off-by: Your Name <your@email.com>" line to the
+	  "Signed-off-by: Your Name <you@example.com>" line to the
 	  commit message (or just use the option "-s" when
 	  committing) to confirm that you agree to the Developer's
 	  Certificate of Origin

ident.c

@@ -185,7 +185,7 @@ static const char *env_hint =
 "\n"
 "Run\n"
 "\n"
-"  git config --global user.email \"you@email.com\"\n"
+"  git config --global user.email \"you@example.com\"\n"
 "  git config --global user.name \"Your Name\"\n"
 "\n"
 "to set your account\'s default identity.\n"