Renamed --config command line parameter

docs/COMMAND_LINE.MD

@@ -11,7 +11,8 @@
 --light-mode         Don't allocate RandomX dataset, saves 2GB of RAM
 --loglevel           Verbosity of the log, integer number between 0 and 6
 --data-dir           Path to store general p2pool files (log, cache, peer data, etc.), default is current directory
---config             Name of p2pool sidechain's config file (don't use it unless you want to mine to a different p2pool chain)
+--config             Deprecated, will be removed in the next version. Use --sidechain-config instead
+--sidechain-config   Name of the p2pool sidechain parameters file (only use it if you run your own sidechain)
 --data-api           Path to the p2pool JSON data (use it in tandem with an external web-server). Not affected by --data-dir setting!
 --local-api          Enable /local/ path in api path for Stratum Server and built-in miner statistics
 --stratum-api        An alias for --local-api