Fixing typo "ans" to "an".

raylib-coding-conventions.md

@@ -30,4 +30,4 @@ void SomeFunction()
    // TODO: Do something here!
 }
 ```
-When proposing new functions, please try to use a clear naming for function-name and functions-parameters, in case of doubt, open ans issue for discussion.
+When proposing new functions, please try to use a clear naming for function-name and functions-parameters, in case of doubt, open an issue for discussion.