doc/git-worktree: mention "refs/rewritten" as per-worktree refs

Some references are special in the context of worktrees as they are
considered to be per-worktree instead of shared across all of the
worktrees. Most importantly, this includes "refs/worktree/" that have
explicitly been designed such that users can create per-woorktree refs.
But there are also special references that have an associated meaning
like "refs/bisect/", which is used to track state of git-bisect(1).

These special per-worktree references are documented in git-worktree(1),
but one instance is missing. In a9be29c (sequencer: make refs
generated by the `label` command worktree-local, 2018-04-25), we have
converted "refs/rewritten/" to be a per-worktree reference as well.
These references are used by our sequencer infrastructure to generate
labels for rebased commits. So in order to allow for multiple concurrent
rebases to happen in different worktrees, these references need to be
tracked per worktree.

We forgot to update our documentation to mention these new per-worktree
references, which is fixed by this patch.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

Documentation/git-worktree.txt

@@ -286,7 +286,8 @@ rules and how to access refs of one worktree from another.
 In general, all pseudo refs are per-worktree and all refs starting with
 `refs/` are shared. Pseudo refs are ones like `HEAD` which are directly
 under `$GIT_DIR` instead of inside `$GIT_DIR/refs`. There are exceptions,
-however: refs inside `refs/bisect` and `refs/worktree` are not shared.
+however: refs inside `refs/bisect`, `refs/worktree` and `refs/rewritten` are
+not shared.
 
 Refs that are per-worktree can still be accessed from another worktree via
 two special paths, `main-worktree` and `worktrees`. The former gives
@@ -363,8 +364,8 @@ linked worktree `git rev-parse --git-path HEAD` returns
 `/path/other/test-next/.git/HEAD` or `/path/main/.git/HEAD`) while `git
 rev-parse --git-path refs/heads/master` uses
 `$GIT_COMMON_DIR` and returns `/path/main/.git/refs/heads/master`,
-since refs are shared across all worktrees, except `refs/bisect` and
-`refs/worktree`.
+since refs are shared across all worktrees, except `refs/bisect`,
+`refs/worktree` and `refs/rewritten`.
 
 See linkgit:gitrepository-layout[5] for more information. The rule of
 thumb is do not make any assumption about whether a path belongs to