Update exit keys documentation (initial)

Author: daGscheid

docs/02-guides/04-operation/exit-keys.md

@@ -2,4 +2,14 @@
 
 ## Exit an individual key
 
-## Exit all keys from a validator client
+1. Enter the Staking page in Stereum
+2. Locate the individual key you want to Exit, on the right you will find multiple buttons. 
+3. Click "Exit & Withdrawal" button among them - if you need guidance, you can check the tooltips at the bottom. 
+4. A modal will pop up 
+
+## Exit all keys from a validator client
+
+1. Enter the Staking page in Stereum
+2. Make sure you have selected the correct validator client (if you should run multiple)
+3. Locate the validator client command to "Withdraw & Exit All Keys". Click it!
+4. A modal will pop up