[docs] Fix the warnings during docs-llvm-html build

[djtodoro]

Summary

Before these fixes the build of docs-llvm-html would fail.

The D80959 introduced options that are not recognized:

llvm-project/llvm/docs/CommandGuide/llvm-dwarfdump.rst:40:unknown option: --debug-info

The rG8bc03d216824 introduced a reference to an undefined label:

llvm-project/llvm/docs/GlobalISel/GenericOpcode.rst:295:undefined label: i_intr_llvm_ptrmask (if the link has no caption the label must precede a section header)

[jhenderson]

The second one LGTM. Please commit it separately. For the first, how does syntax highlighting look with the new spaces between option and argument? Does it look okay, or is the highlighting messed up?

[JDevlieghere]

In D82460#2111423, @jhenderson wrote:

The second one LGTM. Please commit it separately. For the first, how does syntax highlighting look with the new spaces between option and argument? Does it look okay, or is the highlighting messed up?

This is what we had before I removed them on @MaskRay's request, so it should be fine.

[djtodoro]

Thanks! (closed with rG019d7a32febc and rG95435117addb)

llvm/docs/CommandGuide/llvm-dwarfdump.rst

.. option:: --verify
             Verify the structure of the DWARF information by verifying the
             compile unit chains, DIE relationships graph, address
             ranges, and more.
 
 .. option:: --version
 
             Display the version of the tool.
 
-.. option:: --debug-abbrev, --debug-addr, --debug-aranges, --debug-cu-index, --debug-frame[=<offset>], --debug-gnu-pubnames, --debug-gnu-pubtypes, --debug-info[=<offset>], --debug-line[=<offset>], --debug-line-str, --debug-loc[=<offset>], --debug-loclists[=<offset>], --debug-macro, --debug-names, --debug-pubnames, --debug-pubtypes, --debug-ranges, --debug-rnglists, --debug-str, --debug-str-offsets, --debug-tu-index, --debug-types[=<offset>], --eh-frame[=<offset>], --gdb-index, --apple-names, --apple-types, --apple-namespaces, --apple-objc
+.. option:: --debug-abbrev, --debug-addr, --debug-aranges, --debug-cu-index, --debug-frame[=<offset>], --debug-gnu-pubnames, --debug-gnu-pubtypes, --debug-info [=<offset>], --debug-line [=<offset>], --debug-line-str, --debug-loc [=<offset>], --debug-loclists [=<offset>], --debug-macro, --debug-names, --debug-pubnames, --debug-pubtypes, --debug-ranges, --debug-rnglists, --debug-str, --debug-str-offsets, --debug-tu-index, --debug-types [=<offset>], --eh-frame [=<offset>], --gdb-index, --apple-names, --apple-types, --apple-namespaces, --apple-objc
 
             Dump the specified DWARF section by name. Only the
             `.debug_info` section is shown by default. Some entries
             support adding an `=<offset>` as a way to provide an
             optional offset of the exact entry to dump within the
             respective section. When an offset is provided, only the
             entry at that offset will be dumped, else the entire
             section will be dumped.

llvm/docs/GlobalISel/GenericOpcode.rst

.. caution::
   There are currently no in-tree targets that use this with addressable units
   not equal to 8 bit.
 
 G_PTRMASK
 ^^^^^^^^^^
 
 Zero out an arbitrary mask of bits of a pointer. The mask type must be
 an integer, and the number of vector elements must match for all
-operands. This corresponds to :ref:`i_intr_llvm_ptrmask`.
+operands. This corresponds to `i_intr_llvm_ptrmask`.
 
 .. code-block:: none
 
   %2:_(p0) = G_PTRMASK %0, %1
 
 G_SMIN, G_SMAX, G_UMIN, G_UMAX
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^