Add controller buffer constants, finish misc battle doc

src/battle_controller_link_partner.c

@@ -442,7 +442,7 @@ static void LinkPartnerHandleGetMonData(void)
             monToCheck >>= 1;
         }
     }
-    BtlController_EmitDataTransfer(1, size, monData);
+    BtlController_EmitDataTransfer(BUFFER_B, size, monData);
     LinkPartnerBufferExecCompleted();
 }