gnulib-tool.py: Update type hints and docstring.

[Collin Funk]

Two type hints are incorrectly marked 'dict[str, str]' instead of
'dict[str, tuple[re.Pattern, str] | None]'. I assume I forgot to
change these when inlining sed expressions to use re.sub().

Previously the dict would be:

    # key : value
    'file-category' : 'sed-expression'

but now it is:

    # Arguments for re.sub()
    'file-category' : (regexp, 'replacement-string')
    # or no replacements needed.
    'file-category' : None

I've also updated an outdated doc string since we no longer use sed
invocations for this and we don't perform license replacements on
source files.

Now that I think about it, I should have used a list of re.sub()
arguments. But I think these variables are only used by the 'config-h'
module to replace "#if HAVE_CONFIG_H" with "#if 1". Until we need
something more complex than that, how it is currently written should
work fine.

Collin

0001-gnulib-tool.py-Update-type-hints-and-docstring.patch
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