fix docstring

Author: albertodonato

stacklet/client/platform/client.py

@@ -172,7 +172,11 @@ def _doc(self) -> str:
             lines.append("")
         if self.snippet.optional:
             lines.append("Optional parameters: ")
-            for param, desc in self.snippet.optional.items():
+            for param, details in self.snippet.optional.items():
+                if isinstance(details, str):
+                    desc = details
+                else:
+                    desc = details["help"]
                 lines.append(f" {param}: {desc}")
             lines.append("")
         if self.snippet.pagination: