api.md: Apply second batch of suggestions from code review

Co-authored-by: Hussein Farran <hmfarran@gmail.com>

docs/api.md

@@ -5,8 +5,10 @@ Archipelago's generation and server. Once a seed is generated, a client or mod i
 required to send and receive items between the game and server.
 
 Client implementation is out of scope of this document. Please refer to an
-existing game that provides a similar API to yours or read the
+existing game that provides a similar API to yours.
-[network protocol.md](https://github.com/ArchipelagoMW/Archipelago/blob/main/docs/network%20protocol.md)
+Refer to the following documents as well:
+    * [network protocol.md](https://github.com/ArchipelagoMW/Archipelago/blob/main/docs/network%20protocol.md)
+    * [adding games.md](https://github.com/ArchipelagoMW/Archipelago/blob/main/docs/adding%20games.md)
 
 Archipelago will be abbreviated as "AP" from now on.
 
@@ -142,12 +144,6 @@ on the the current `state` (items that can be collected).
 An item rule is a function that returns `True` or `False` for a `Location` based
 on a single item. It can be used to reject placement of an item there.
 
-### Plando
-
-Plando allows a player to place certain items in certain locations through their
-player options. While specifics are not covered here, plando is automatically
-possible by providing a complete world with a working create_item method.
-
 
 ## Implementation