Update SynchronizedCollection`1.xml (#8033)

Update reference to Items property

Author: andrew-field

xml/System.Collections.Generic/SynchronizedCollection`1.xml

@@ -64,7 +64,7 @@
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 ## Remarks  
- The <xref:System.Collections.Generic.SynchronizedCollection%601> stores data in a <xref:System.Collections.Generic.List%601> container and provides an object that can be set and used to synchronize access to the collection so that it is thread-safe. The <xref:System.Collections.Generic.IList%601> container can be recovered using the <xref:System.Collections.Generic.SynchronizedCollection%601.Items%2A> method. The synchronized object can be recovered using the <xref:System.Collections.Generic.SynchronizedCollection%601.SyncRoot%2A> property. It can only be set using one of the constructors that take the `syncRoot` parameter.  
+ The <xref:System.Collections.Generic.SynchronizedCollection%601> stores data in a <xref:System.Collections.Generic.List%601> container and provides an object that can be set and used to synchronize access to the collection so that it is thread-safe. The <xref:System.Collections.Generic.IList%601> container can be recovered using the <xref:System.Collections.Generic.SynchronizedCollection%601.Items%2A> property. The synchronized object can be recovered using the <xref:System.Collections.Generic.SynchronizedCollection%601.SyncRoot%2A> property. It can only be set using one of the constructors that take the `syncRoot` parameter.  
   
  ]]></format>
     </remarks>