Fix typo in "parameter". (dotnet#8074)

Author: bgrainger

xml/System.Diagnostics/Activity.xml

@@ -1314,7 +1314,7 @@ The specified format will take precedence over `Parent.IdFormat`, the <xref:Syst
 ## Remarks
 
 When passing code value different than ActivityStatusCode.Error, the Activity.StatusDescription will reset to `null` value.
-            The description paramater will be respected only when passing ActivityStatusCode.Error value.
+            The description parameter will be respected only when passing ActivityStatusCode.Error value.
 
           ]]></format>
         </remarks>