Added example to .split (#18736)

client/src/pages/guide/english/ruby/ruby-string-methods/index.md

@@ -90,6 +90,10 @@ _Note that the first letter is only capitalized if it is at the beginning of the
     ```ruby
     "H-e-l-l-o".split('-') #=> ["H", "e", "l", "l", "o"]
     ```
+*   To split a word in to individual letters :
+    ``` ruby
+    "hello".split("") #=> ["h", "e", "l", "l", "o"]
+    ```
     
 ### Chop: