bug#68370: 30.0.50; pcase eieio, map, seq, and cl-struct constructs are not described in the manual

[Stefan Monnier]

>> RMS recently pointed that `pcase' docstring describes map, seq, and
>> radix-tree-leaf constructs.
>>
>> However, they are not documented in the 11.4.1 The ‘pcase’ macro section
>> of Elisp manual.
>>
>> AFAIU, eieio, map, seq, cl-struct, and a number of other constructs
>> mentioned in the docstring are automatically added there by
>> `pcase-defmacro'.
>>
>> I see no need to document specialized pcase constructs like
>> `eshell-index-range', but eieie, map, seq, and cl-struct appears to be
>> matching common Elisp data structures. I think that they should be
>> documented in the manual.
>
> Copying in Stefan Monnier.

AFAIK these "belong" to `map.el`, `seq.el`, etc... so that's where they
should be documented.  The documentation for `pcase` could of course
include corresponding cross-references.


        Stefan