git-send-email.txt: move --format-patch paragraph to a proper location

When introducing --format-patch, its documentation was accidentally inserted
in the middle of documentation for --validate.

Signed-off-by: Adeodato Simó <dato@net.com.org.es>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-send-email.txt

@@ -197,12 +197,6 @@ Administering
 --[no-]validate::
 	Perform sanity checks on patches.
 	Currently, validation means the following:
-
---[no-]format-patch::
-	When an argument may be understood either as a reference or as a file name,
-	choose to understand it as a format-patch argument ('--format-patch')
-	or as a file name ('--no-format-patch'). By default, when such a conflict
-	occurs, git send-email will fail.
 +
 --
 		*	Warn of patches that contain lines longer than 998 characters; this
@@ -212,6 +206,12 @@ Administering
 Default is the value of 'sendemail.validate'; if this is not set,
 default to '--validate'.
 
+--[no-]format-patch::
+	When an argument may be understood either as a reference or as a file name,
+	choose to understand it as a format-patch argument ('--format-patch')
+	or as a file name ('--no-format-patch'). By default, when such a conflict
+	occurs, git send-email will fail.
+
 
 CONFIGURATION
 -------------