Updated docs from upstream

Triggered by ce9d830b5a01106ad3fadfa6c37e04b9ffdf4dc9

Author: glydr

docs/actions.md

@@ -15,6 +15,7 @@ Actions are like shell commands: they take arguments and do something! Skytable
 * [MKSNAP](actions/MKSNAP.md)
 * [MSET](actions/MSET.md)
 * [MUPDATE](actions/MUPDATE.md)
+* [POP](actions/POP.md)
 * [SDEL](actions/SDEL.md)
 * [SET](actions/SET.md)
 * [SSET](actions/SSET.md)

docs/actions/POP.md

@@ -0,0 +1,10 @@
+---
+id: pop
+title: POP
+---
+:::note About
+**Time complexity**: O(n)  
+**Arguments**: `POP <key1> <key2> ...`  
+**Returns**: Returns an array with either the values or response codes as the elements  
+:::
+Deletes and returns the values of the provided keys. If the database is poisoned, this will return a server error. An exceptional scenario can arise when the database fails in-between removing all the keys. In that case, you get the server error response code instead of the keys. If the server recovers inbetween, then the appropriate values (if any) will be returned. In all other cases a NIL error is returned (code 1)