Improve grammar (#1805)

SebastianAigner · web-flow · commit a053cf15782b · 2021-12-25T15:58:00.000+03:00
diff --git a/docs/builtin-classes.md b/docs/builtin-classes.md
@@ -146,7 +146,7 @@ All enum classes are serializable out of the box without having to mark them `@S
 as the following example shows.
 
 ```kotlin          
-// @Serializable annotation is not need for a enum classes
+// The @Serializable annotation is not needed for enum classes
 enum class Status { SUPPORTED }
         
 @Serializable
