typo: cancelation -> cancellation (dotnet#2161)

Author: nschonni

xml/System.Activities.Statements/CompensableActivity.xml

@@ -176,7 +176,7 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- <xref:System.Activities.Statements.CompensableActivity.CancellationHandler%2A> can be used to specify custom cancelation logic for the <xref:System.Activities.Statements.CompensableActivity.Body%2A> of the <xref:System.Activities.Statements.CompensableActivity>.  
+ <xref:System.Activities.Statements.CompensableActivity.CancellationHandler%2A> can be used to specify custom cancellation logic for the <xref:System.Activities.Statements.CompensableActivity.Body%2A> of the <xref:System.Activities.Statements.CompensableActivity>.  
   
  This property is read-only at runtime. If the value is set at runtime, an <xref:System.InvalidOperationException> is thrown.