invalid enums

Author: tkruse

CppCoreGuidelines.md

@@ -7512,8 +7512,8 @@ The default gives a consecutive set of values that is good for `switch`-statemen
 ##### Example
 
     enum class Col1 { red, yellow, blue };
-    enum class Col2 { red = 1, red = 2, blue = 2 }; // typo
-    enum class Month { jan = 1, feb, mar, apr, mar, jun,
+    enum class Col2 { red = 1, yellow = 2, blue = 2 }; // typo
+    enum class Month { jan = 1, feb, mar, apr, may, jun,
                        jul, august, sep, oct, nov, dec }; // starting with 1 is conventional
     enum class Base_flag { dec = 1, oct = dec << 1, hex = dec << 2 }; // set of bits