bug#36496: [PATCH] Describe the rx notation in the lisp manual

[Mattias Engdegård]

The rx notation is useful and complex enough to merit inclusion in the manual.

Right now, it's mainly described in the `rx' doc string, which is fairly 
well-written but quite long and a bit unstructured. Describing it in the manual 
permits a different pace and style of exposition, the inclusion of examples and 
related information, structured into separate sections with cross-references.

Proposed patch attached. It covers all rx features, functions, macros, 
including the pcase pattern, and a mention of the corresponding string regexp 
constructs.

The existing `rx' doc string can be left unchanged, or reduced to something 
more concise, perhaps without a description of the entire rx language but with 
a manual reference. Suggestions are welcome.

0001-Describe-the-rx-notation-in-the-elisp-manual.patch
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