add missing doc

distance-oracle/src/lib.rs

docs/api/runtime-calls.md

pallets/certification/src/types.rs

pallets/distance/src/median.rs

pallets/membership/src/lib.rs

pallets/oneshot-account/src/check_nonce.rs

pallets/smith-members/src/lib.rs

primitives/distance/src/lib.rs

primitives/membership/src/lib.rs

resources/metadata.scale