docs(git): trim verbose comments and fix prose-rule violations

lua/git/repo.lua

@@ -121,7 +121,7 @@ end
 
 function Repo:stop_watcher()
     -- Stop the libuv watcher first so no further fs-events can trigger
-    -- self:refresh(); only then tear down the debounce handle. The reverse
+    -- self:refresh(). Only then tear down the debounce handle. The reverse
     -- order leaves a window where an in-flight watcher callback would call
     -- a closed debounce timer.
     if self.watcher then
@@ -150,7 +150,7 @@ end
 ---@param repo ow.Git.Repo
 local function do_refresh(repo)
     -- `--branch` adds the `## branch...upstream [ahead/behind]` line that
-    -- the sidebar parses; the per-buffer indicator only needs the XY +
+    -- the sidebar parses. The per-buffer indicator only needs the XY +
     -- path lines, so it ignores `##` lines below. Running with `--branch`
     -- lets the sidebar reuse this single subprocess via the GitRefresh
     -- data payload instead of spawning its own.