pyln-client: use \n as line separator in lightning-cli help

Changelog-Changed: Interpret \n as the line separator in plugins to enhance the readability of lightning-cli help.

Signed-off-by: Nishant Bansal <[email protected]>
[ Modified to use \n not | --RR ]

Author: NishantBansal2003

contrib/pyln-client/pyln/client/plugin.py

@@ -84,7 +84,9 @@ def get_usage(self):
                 args.append("[%s]" % arg)
 
         if self.description is not None:
-            args.append("\n%s" % self.description)
+            doc = inspect.getdoc(self.func)
+            doc = re.sub('\n', '\n ', doc)
+            args.append(" \n %s" % doc)
 
         return " ".join(args)