Documentation/SubmittingPatches: clarify GMail section and SMTP

We keep getting mangled submissions from GMail's web interface. Try to
be more proactive in SubmittingPatches by

- pointing to MUA specific instructions early on,
- structuring the GMail section more clearly,
- putting send-email/SMTP before imap-send/IMAP.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/SubmittingPatches

@@ -41,6 +41,7 @@ Checklist (and a short version for the impatient):
 	  maintainer (gitster@pobox.com) if (and only if) the patch
 	  is ready for inclusion. If you use git-send-email(1),
 	  please test it first by sending email to yourself.
+	- see below for instructions specific to your mailer
 
 Long version:
 
@@ -519,9 +520,27 @@ Gmail
 
 GMail does not appear to have any way to turn off line wrapping in the web
 interface, so this will mangle any emails that you send.  You can however
-use any IMAP email client to connect to the google imap server, and forward
+use "git send e-mail" and send your patches through the GMail SMTP server, or
+use any IMAP email client to connect to the google IMAP server and forward
 the emails through that.
 
+To use "git send-email" and send your patches through the GMail SMTP server,
+edit ~/.gitconfig to specify your account settings:
+
+[sendemail]
+	smtpencryption = tls
+	smtpserver = smtp.gmail.com
+	smtpuser = user@gmail.com
+	smtppass = p4ssw0rd
+	smtpserverport = 587
+
+Once your commits are ready to be sent to the mailing list, run the
+following commands:
+
+  $ git format-patch --cover-letter -M origin/master -o outgoing/
+  $ edit outgoing/0000-*
+  $ git send-email outgoing/*
+
 To submit using the IMAP interface, first, edit your ~/.gitconfig to specify your
 account settings:
 
@@ -537,28 +556,11 @@ You might need to instead use: folder = "[Google Mail]/Drafts" if you get an err
 that the "Folder doesn't exist".
 
 Once your commits are ready to be sent to the mailing list, run the
-following command to send the patch emails to your Gmail Drafts
-folder.
+following commands:
 
   $ git format-patch --cover-letter -M --stdout origin/master | git imap-send
 
 Just make sure to disable line wrapping in the email client (GMail web
 interface will line wrap no matter what, so you need to use a real
 IMAP client).
 
-Alternatively, you can use "git send-email" and send your patches
-through the GMail SMTP server.  edit ~/.gitconfig to specify your
-account settings:
-
-[sendemail]
-	smtpencryption = tls
-	smtpserver = smtp.gmail.com
-	smtpuser = user@gmail.com
-	smtppass = p4ssw0rd
-	smtpserverport = 587
-
-Once your commits are ready to be sent to the mailing list, run the
-following commands:
-
-  $ git format-patch --cover-letter -M origin/master -o outgoing/
-  $ git send-email outgoing/*