Fix doc comments on MemberNotNullWhenAttribute (#99331)

src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/NullableAttributes.cs

@@ -163,7 +163,7 @@ sealed class MemberNotNullWhenAttribute : Attribute
     {
         /// <summary>Initializes the attribute with the specified return value condition and a field or property member.</summary>
         /// <param name="returnValue">
-        /// The return value condition. If the method returns this value, the associated parameter will not be null.
+        /// The return value condition. If the method returns this value, the associated field or property member will not be null.
         /// </param>
         /// <param name="member">
         /// The field or property member that is promised to be not-null.
@@ -176,7 +176,7 @@ public MemberNotNullWhenAttribute(bool returnValue, string member)
 
         /// <summary>Initializes the attribute with the specified return value condition and list of field and property members.</summary>
         /// <param name="returnValue">
-        /// The return value condition. If the method returns this value, the associated parameter will not be null.
+        /// The return value condition. If the method returns this value, the associated field and property members will not be null.
         /// </param>
         /// <param name="members">
         /// The list of field and property members that are promised to be not-null.