Add example code for String.remove()

I found the description a bit difficult to understand and there is no demonstration of remove in the tutorials.

Author: per1234

Language/Variables/Data Types/String/Functions/remove.adoc

@@ -44,7 +44,20 @@ None
 // OVERVIEW SECTION ENDS
 
 
+// HOW TO USE SECTION STARTS
+[#howtouse]
+--
 
+[float]
+=== Example Code
+// Describe what the example code is all about and add relevant code   ►►►►► THIS SECTION IS MANDATORY ◄◄◄◄◄
+[source,arduino]
+----
+String greeting = "hello";
+greeting.remove(2, 2);  // greeting now contains "heo"
+----
+[%hardbreaks]
+--
 // HOW TO USE SECTION ENDS