Update standard/lexical-structure.md

Committing in case it gets missed

Co-authored-by: Jon Skeet <[email protected]>

Author: Nigel-Ecma

standard/lexical-structure.md

@@ -616,7 +616,7 @@ The type of a *boolean_literal* is `bool`.
 
 #### 6.4.5.3 Integer literals
 
-Integer literals are used to write values of types `int`, `uint`, `long`, and `ulong`. Integer literals have three possible forms: decimal and, hexadecimal, and binary.
+Integer literals are used to write values of types `int`, `uint`, `long`, and `ulong`. Integer literals have three possible forms: decimal, hexadecimal, and binary.
 
 ```ANTLR
 Integer_Literal