added suggestion: support tree-ish in command args

diff --git a/doc/todo/support_tree-ish_in_command_args.mdwn b/doc/todo/support_tree-ish_in_command_args.mdwn
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+For commands like [[`git-annex-whereis`|git-annex-whereis]] that take a `path` argument, it would help if this could be generalized to taking a [tree-ish](https://git-scm.com/docs/gitglossary#Documentation/gitglossary.txt-aiddeftree-ishatree-ishalsotreeish).  E.g. for `git-annex-whereis` this could be used to look up where previous file versions are stored.