Suggest renaming Emacs source file with '$' in name

[Paul Eggert]

Emacs master commit 2020-10-23T19:07:26Z!stefan@marxist.se 
(72c9d4bee112a7e44316b04f361cc4ad3b16cf76) introduced a file with this name:

test/lisp/minibuffer-resources/data/minibuffer-test-cttq$tion

Unfortunately that '$' causes trouble when I run shell commands like this:

$ git log test/lisp/minibuffer-resources/data/minibuffer-test-cttq$tion
fatal: ambiguous argument 
'test/lisp/minibuffer-resources/data/minibuffer-test-cttq': unknown 
revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

plus, I had problems when I ran shell scripts etc. to update copyright 
dates for 2021 and to merge emacs-27 into master.

I suggest renaming the file in the Emacs source tree. If the '$' is 
needed for a filename test, the test can create a file with that name; 
that should be less of a problem than having a '$' file in the repository.