[PATCH 5/5] doc: document reversive traversal and related modes

[William Hatfield <whatfield.git@gmail.com>]

Add documentation for the new --reverse-traversal, --append-superproject,
and --reversive flags to git-submodule.adoc. These flags enable post-order
traversal through nested submodule hierarchies, which is useful for
cleanup operations and dependency-ordered processing.

The flags only take effect when used with --recursive.

Signed-off-by: William Hatfield <whatfield.git@gmail.com>
---
 Documentation/git-submodule.adoc | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/git-submodule.adoc b/Documentation/git-submodule.adoc
index 95beaee561..2be477952d 100644
--- a/Documentation/git-submodule.adoc
+++ b/Documentation/git-submodule.adoc
@@ -437,6 +437,26 @@ options carefully.
 	only in the submodules of the current repo, but also
 	in any nested submodules inside those submodules (and so on).
 
+--reverse-traversal::
+	This option is only valid for the foreach command and requires
+	`--recursive`.  Process nested submodules in post-order (deepest
+	first) rather than the default pre-order.  This is useful for
+	cleanup operations where nested submodules must be processed
+	before their parents.
+
+--append-superproject::
+	This option is only valid for the foreach command and requires
+	`--recursive`.  After processing all submodules, also run the
+	command in the superproject (top-level repository).  The
+	superproject is displayed as `../<name>` to mirror submodule
+	output style.
+
+--reversive::
+	This option is only valid for the foreach command and is
+	shorthand for `--recursive --reverse-traversal --append-superproject`.
+	It provides a complete "reverse" traversal: deepest submodules
+	first, then their parents, and finally the superproject.
+
 --depth::
 	This option is valid for add and update commands. Create a 'shallow'
 	clone with a history truncated to the specified number of revisions.
-- 
2.53.0-rc0