docs(git): trim three comments

lua/git/editor.lua

@@ -4,13 +4,11 @@ local M = {}
 
 local SENTINEL = "__NVIM_GIT_EDIT__"
 
--- Each git editor invocation runs this body afresh under `sh -c`. The
--- body picks a per-invocation flag file via `$$` (the wrapping shell's
--- pid), prints the sentinel + flag-path + abs-path on stderr so the
--- running Neovim can find both, and polls the flag until Neovim writes
--- it. Concurrent edits inside one git call (e.g. `rebase -i`'s todo
--- plus N reword commits) get distinct flags because each invocation is
--- a fresh shell with a fresh `$$`.
+-- Per-invocation: each `sh -c` body picks a flag file via `$$`,
+-- prints sentinel + flag-path + abs-path on stderr, then polls the
+-- flag until Neovim writes it. `rebase -i` fires the editor many
+-- times (todo + each reword). Each call is a fresh shell with a
+-- fresh `$$`, so flags don't collide.
 local SCRIPT = string.format(
     [=[set -eu
 flag="${TMPDIR:-/tmp}/nvim-git-editor-$$.done"