cxl/Documentation: Spell out globbed sysfs attribute names

Four entries in sysfs-bus-cxl use braced globs to document groups of
attributes. Where the glob factors out a common prefix, as in
cap_{pmem,ram,type2,type3}, no individual attribute name appears in
the file at all and none can be found by grep or get_abi.py search. In
every case the glob also keys get_abi.py validate on the glob string,
so duplicates against separately documented attributes go undetected.

Replace the globs with consecutive What: lines for each attribute.
These lines continue to share the existing metadata and description
and follow the format used in sysfs-driver-ufs and sysfs-bus-iio.

Also restore one missing blank line between entries.

Verify with:
  python3 tools/docs/get_abi.py -D Documentation/ABI/testing validate
  python3 tools/docs/get_abi.py search cap_pmem
  python3 tools/docs/get_abi.py search create_ram_region

validate reports no sysfs-bus-cxl warning, and both searches now return
the stanza where they returned nothing before.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260804232014.2286549-1-alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

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