Remove arg from the UseMutationTrigger docs signature

Author: Shrugsy

query-old/docs/api/created-api/hooks.md

@@ -103,12 +103,6 @@ type UseMutationStateOptions<Definition> = {
 type UseMutationTrigger<Definition> = (
   arg: ArgTypeFrom<Definition>
 ) => Promise<{ data: ResultTypeFrom<Definition> } | { error: BaseQueryError | SerializedError }> & {
-  arg: {
-    endpointName: string; // The name of the given endpoint for the mutation
-    originalArgs: ArgTypeFrom<Definition>; // Arguments passed to the mutation
-    track?: boolean; // Whether the mutation is being tracked in the store
-    startedTimeStamp: number; // Timestamp for when the mutation was initiated
-  };
   requestId: string; // A string generated by RTK Query
   abort: () => void; // A method to cancel the mutation promise
   unwrap: () => Promise<ResultTypeFrom<Definition>>; // A method to unwrap the mutation call and provide the raw response/error