doc: replay: use a nested description list

This bullet list for `--ref-action` introduces a term with a colon.
This is exactly what a description list is, structurally. Let’s be
sylistically consistent and use the desc. list markup construct.[1]

We can reuse the `::` delimiter since we use an open block.
But for consistency use the typical nested description list
delimiter, namely `;;`.

Also drop the harmless but unneeded indentation.

† 1: Same explanation as in the previous commit

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: LemmingAvalanche

Documentation/git-replay.adoc

@@ -80,10 +80,10 @@ incompatible with `--contained` (which is a modifier for `--onto` only).
 	Control how references are updated. The mode can be:
 +
 --
-	* `update` (default): Update refs directly using an atomic transaction.
-	  All refs are updated or none are (all-or-nothing behavior).
-	* `print`: Output update-ref commands for pipeline use. This is the
-	  traditional behavior where output can be piped to `git update-ref --stdin`.
+`update` (default);; Update refs directly using an atomic transaction.
+	All refs are updated or none are (all-or-nothing behavior).
+`print`;; Output update-ref commands for pipeline use. This is the
+	traditional behavior where output can be piped to `git update-ref --stdin`.
 --
 +
 The default mode can be configured via the `replay.refAction` configuration variable.