Fix incorrect docstring on List.EnsureCapacity (#95956)

* Fix incorrect docstring on List.EnsureCapacity

* Fix typo

* Be less specific

src/libraries/System.Private.CoreLib/src/System/Collections/Generic/List.cs

@@ -426,7 +426,7 @@ public void CopyTo(T[] array, int arrayIndex)
         /// <summary>
         /// Ensures that the capacity of this list is at least the specified <paramref name="capacity"/>.
         /// If the current capacity of the list is less than specified <paramref name="capacity"/>,
-        /// the capacity is increased by continuously twice current capacity until it is at least the specified <paramref name="capacity"/>.
+        /// the capacity is increased to at least <paramref name="capacity"/>.
         /// </summary>
         /// <param name="capacity">The minimum capacity to ensure.</param>
         /// <returns>The new capacity of this list.</returns>