qca-swiss-army-knife: update docs to refer to wiki
qca-swiss-army-knife: update docs to refer to wiki

Documenation should be done on wikis. We just point to the top
level project wiki.

Signed-off-by: Luis R. Rodriguez <d4fa18192c5a479e564d29c2300c2e15afd1d8d7@frijolero.org>

qca/qca-swiss-army-knife,qca/qca-swiss-army-knife,qca/qca-swiss-army-knife,qca/qca-swiss-army-knife,mcgrof/qca-swiss-army-knife