docs: add Section about very loose stoploss on exchange

closes freqtrade#12598

Author: xmatthias

docs/stoploss.md

@@ -31,9 +31,14 @@ The Order-type will be ignored if only one mode is available.
     --8<-- "includes/exchange-features.md"
 
 !!! Note "Tight stoploss"
-    <ins>Do not set too low/tight stoploss value when using stop loss on exchange!</ins>  
+    Do not set too low/tight stoploss value when using stop loss on exchange!  
     If set to low/tight you will have greater risk of missing fill on the order and stoploss will not work.
 
+!!! Warning "Loose stoploss"
+    Using stoploss on exchange with a very wide stoploss (e.g. -1) may fail to place the stoploss order on exchange due to exchange limitations.
+    In that case, the bot will fallback to using the `emergency_exit` order type to place a market order as placing the stoploss order failed.
+    Freqtrade currently does not implement a limitation to avoid this situation, so please ensure your stoploss values are within reasonable limits for your exchange or disable stoploss on exchange.
+
 ### stoploss_on_exchange and stoploss_on_exchange_limit_ratio
 
 Enable or Disable stop loss on exchange.