iwlwifi: fw: api: add link to PHY context command struct v1

There are two possible versions of this command in use today,
add a link to v1 as well in the documentation.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211204083238.d7c4ed8e85e0.I524a84e03068ecf7c3125ad028f0ca465d41c0f3@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>