helptext: add missing newline to Rust helptext
This makes it so the list renders properly.
Differential Revision: https://phab.mercurial-scm.org/D12007
--- a/mercurial/helptext/rust.txt Mon Jan 24 21:17:04 2022 -0800
+++ b/mercurial/helptext/rust.txt Tue Jan 18 10:32:11 2022 +0100
@@ -15,6 +15,7 @@
========
The following operations are sped up when using Rust:
+
- discovery of differences between repositories (pull/push)
- nodemap (see :hg:`help config.format.use-persistent-nodemap`)
- all commands using the dirstate (status, commit, diff, add, update, etc.)