WestCommand has no .configuration field, it's .config.
In the same (and cursed!) sentence, also fix the broken link to
west.command.WestCommand by switching the link target from the
unusual `py:class::` to the common `autoclass::` used by all other
classes in the same page. I don't understand why that fixes the
hyperlink but it works and it's consistent.
Signed-off-by: Marc Herbert <marc.herbert@intel.com>
459935c09d