Updated documentation related to keymap

Author: sandeep-vedam

docs/plugins/keymap.md

@@ -7,7 +7,16 @@ SDK provides an option to over-ride the default keymap with the new keymap.
 This can be done using the below snippet :
 
 ```js
-this.application.keymapping = <custom_key_map>
+this.application.overRideKeyMap(customKeyMap, keepDefaults)
 ```
 
-This will Update the existing keymap with the latest keymap
+By default `keepDefaults` will be false.
+
+`customKeyMap` : Keymap to be overidden
+
+`keepDefaults`: Flag to overide the the default keymap or not.
+
+If set to `false`, it will override the existing keymap.
+
+If set to `true`, it will be merged with the base keymap along with the exsiting keymap, where it has all the keys which has same values.
+