docs: Fix wrong callable sphinx keyword
Fix errors referenced at [1].
Only 2 fixes as the other one already got fixed in an earlier diff.
Test Plan
tox
Migrated from D752 (view on Phabricator)
Fix errors referenced at [1].
Only 2 fixes as the other one already got fixed in an earlier diff.
tox
Migrated from D752 (view on Phabricator)