Fix typo in a summary comment in SharedAttribute (#67120)

src/libraries/System.Composition.AttributedModel/src/System/Composition/SharedAttribute.cs

@@ -34,7 +34,7 @@ public SharedAttribute(string sharingBoundaryName) : base(SharingBoundaryPartMet
         }
 
         /// <summary>
-        /// he boundary outside of which this part is inaccessible.
+        /// The boundary outside of which this part is inaccessible.
         /// </summary>
         public string SharingBoundary => (string)base.Value;
     }