Anton Lydike 6ad82fcc7d [FileCheck][Docs] Fix regex for FileCheck variable names (#97301) ...

This fixes a minor oversight in the FileCheck documentation on what is
considered a valid variable name.

Global variables are prefixed with a `$`, which is explained two
paragraphs below, but this was omitted in the presented regex in this
paragraph.

2024-07-02 11:53:15 +01:00

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