[Docs] Fix IR and TableGen grammar inconsistencies

IR:
- globals (and functions, ifuncs, aliases) can have a partition
- catchret has a `to` before the label
- the sint/int types do not exist
- signext comes after the type
- a variable was missing its type

TableGen:
- The second value after a `#` concatenation is optional
  See e.g. llvm/lib/Target/X86/X86InstrAVX512.td:L3351
- IncludeDirective and PreprocessorDirective were never referenced in
  the grammar
- Add some missing ;
- Parent classes of multiclasses can have generic arguments.
  Reuse the `ParentClassList` that is already used in other places.

MIR:
- liveins only allows physical registers, which start with a $

Differential Revision: https://reviews.llvm.org/D116674

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