added doc about updating Serene/Serenity
added doc about updating Serene/Serenity

WasimAhmad/Serenity,rolembergfilho/Serenity,rolembergfilho/Serenity,WasimAhmad/Serenity,volkanceylan/Serenity,WasimAhmad/Serenity,rolembergfilho/Serenity,volkanceylan/Serenity,rolembergfilho/Serenity,rolembergfilho/Serenity,volkanceylan/Serenity,WasimAhmad/Serenity,volkanceylan/Serenity,volkanceylan/Serenity,WasimAhmad/Serenity