More small readability enhancements (#1296)

* More small readability enhancements

* Pacify CC on manual checks

packages/api-derive/src/chain/getHeader.ts

@@ -26,7 +26,6 @@ import { HeaderAndValidators } from './subscribeNewHead';
  */
 export function getHeader (api: ApiInterfaceRx): (hash: Uint8Array | string) => Observable<HeaderExtended | undefined> {
   return (hash: Uint8Array | string): Observable<HeaderExtended | undefined> =>
-    // tslint:disable-next-line
     (combineLatest([
       api.rpc.chain.getHeader(hash),
       api.query.session
@@ -40,7 +39,6 @@ export function getHeader (api: ApiInterfaceRx): (hash: Uint8Array | string) =>
         // where rpc.chain.getHeader throws, we will land here - it can happen that
         // we supplied an invalid hash. (Due to defaults, storeage will have an
         // empty value, so only the RPC is affected). So return undefined
-        // tslint:disable-next-line
         of() as Observable<undefined>
       ),
       drr()