Update stale docstring with 'EnsureOneOf' introduced. (#6501)

* Update stale docstring with 'EnsureOneOf' introduced.

* Apply review suggestions.

substrate/frame/treasury/src/lib.rs

@@ -316,7 +316,7 @@ decl_module! {
 
 		/// The amount held on deposit per byte within the tip report reason.
 		const TipReportDepositPerByte: BalanceOf<T> = T::TipReportDepositPerByte::get();
-		
+
 		/// The treasury's module id, used for deriving its sovereign account ID.
 		const ModuleId: ModuleId = T::ModuleId::get();
 
@@ -355,6 +355,8 @@ decl_module! {
 
 		/// Reject a proposed spend. The original deposit will be slashed.
 		///
+		/// May only be called from `T::RejectOrigin`.
+		///
 		/// # <weight>
 		/// - Complexity: O(1)
 		/// - DbReads: `Proposals`, `rejected proposer account`
@@ -375,6 +377,8 @@ decl_module! {
 		/// Approve a proposal. At a later time, the proposal will be allocated to the beneficiary
 		/// and the original deposit will be returned.
 		///
+		/// May only be called from `T::ApproveOrigin`.
+		///
 		/// # <weight>
 		/// - Complexity: O(1).
 		/// - DbReads: `Proposals`, `Approvals`