[PATCH] Rust: fix description in Release Notes to 2.55

[Junio C Hamano <gitster@pobox.com>]

Finish incomplete sentence to say that we

 - build Git 2.55 by default with Rust,
 - but you can opt out and build 2.55 without Rust,
 - but Rust will become mandatory in Git 3.0 and later.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * I usually do not bother with updating "historical" documents, but
   this one seems to have already caused a confusion, so...

 Documentation/RelNotes/2.55.0.adoc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/RelNotes/2.55.0.adoc b/Documentation/RelNotes/2.55.0.adoc
index f5643534dc..e7e77a8112 100644
--- a/Documentation/RelNotes/2.55.0.adoc
+++ b/Documentation/RelNotes/2.55.0.adoc
@@ -85,8 +85,8 @@ Performance, Internal Implementation, Development Support etc.
  * Promisor remote handling has been refactored and fixed in
    preparation for auto-configuration of advertised remotes.
 
- * Rust support is enabled by default (but still allows opting out) in
-   some future version of Git.
+ * Rust support is enabled by default (but still allows opting out);
+   in Git version 3.0, Rust will become mandatory.
 
  * Preparation of the xdiff/ codebase to work with Rust.
 
-- 
2.55.0-270-g106a830b98