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

Changelog-Changed: Replaced \n with | as the line separator
in the plugin to enhance the readability of lightning-cli help.

Signed-off-by: Nishant Bansal <[email protected]>

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+', ' | ', doc)
+            args.append(" | %s" % doc)
 
         return " ".join(args)