Update range-lastcolumn.md

Author: JarbasHorst

api-reference/beta/api/range-lastcolumn.md

@@ -13,7 +13,7 @@ Namespace: microsoft.graph
 
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-Gets the last column within the range. For example, the last column of "B2:D5" is "D2:D5".
+Gets the last column within the range. For example, the last column of *B2:D5* is *D2:D5*.
 
 [!INCLUDE [national-cloud-support](../../includes/global-us.md)]