docs/rl-0.9: fix release notes formatting

Author: Soliprem

docs/manual/release-notes/rl-0.9.md

@@ -2,7 +2,7 @@
 
 ## Changelog {#sec-release-0-9-changelog}
 
-
 [suimong](https://github.com/suimong):
 
-- Fix `vim.tabline.nvimBufferline` where `setupOpts.options.hover` requires `vim.opt.mousemoveevent` to be set.
+- Fix `vim.tabline.nvimBufferline` where `setupOpts.options.hover` requires
+  `vim.opt.mousemoveevent` to be set.