small documentation fix Json (#5283)

* remove = sign
* Capital

std/haxe/Json.hx

@@ -23,9 +23,9 @@ package haxe;
 
 /**
 	Crossplatform JSON API: it will automatically use the optimized native API if available.
-	Use `-D haxeJSON` to force usage of the Haxe implementation even if a native API is found: 
-	this will provide extra encoding features such as enums (replaced by their index) and StringMaps.
-	=
+	Use `-D haxeJSON` to force usage of the Haxe implementation even if a native API is found:
+	This will provide extra encoding features such as enums (replaced by their index) and StringMaps.
+
 	@see http://haxe.org/manual/std-Json.html
 **/
 class Json {