Releaseotes --check error

[Craig Ozancin]

While looking at releasenotes documentation, I discovered that hg
releasenotes --check does not work.

I spent sometime looking at the code. I have a minimal readability with
Python, but was able to figure out that the issue is in this set of code.

Line 350:   admonition = re.search(RE_DIRECTIVE, ctx.description())

The RE_DIRECTIVE is defined as:

Line 111:   RE_DIRECTIVE = re.compile(br'^\.\.
([a-zA-Z0-9_]+)::\s*([^$]+)?$')

ctx.description is valid. The search does not find the invalid releasenote
tag:

Add releasenotes test:

.. abcd::

   An invalid releasenotes section reference.
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