man: refresh after recent changes

Change-Id: Ibd60f89406e89255b3284413442b1d9c0ccbfb6d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/559601
Commit-Queue: Mike Frysinger <vapier@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: Mike Frysinger <vapier@google.com>
Reviewed-by: Jeffery Miller <jefferymiller@google.com>

man/repo-manifest.1

@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man.
-.TH REPO "1" "February 2026" "repo manifest" "Repo Manual"
+.TH REPO "1" "March 2026" "repo manifest" "Repo Manual"
 .SH NAME
 repo \- repo manifest - manual page for repo manifest
 .SH SYNOPSIS
@@ -478,6 +478,11 @@ of an existing project without completely replacing the existing project
 definition. This makes the local manifest more robust against changes to the
 original manifest.
 .PP
+The `extend\-project` element can also contain `annotation`, `copyfile`, and
+`linkfile` child elements. These are added to the project's definition. A
+`copyfile` or `linkfile` with a `dest` that already exists in the project will
+overwrite the original.
+.PP
 Attribute `path`: If specified, limit the change to projects checked out at the
 specified path, rather than all projects with the given name.
 .PP