decode content correctly and update error msg for invoke sync

Author: MOmarMiraj

example/example.py

@@ -305,7 +305,7 @@ async def create_and_replace_document_item(client: Client):
     )
     # [developer-docs.sdk.python.read-document-item]-end
 
-    print(str(content))
+    print(content.decode())
 
     await client.items.delete(replaced_item.vault_id, replaced_item.id)
 

src/onepassword/core.py

@@ -45,7 +45,7 @@ def _invoke_sync(invoke_config):
     serialized_config = json.dumps(invoke_config)
     if len(serialized_config.encode()) > MESSAGE_LIMIT:
         raise ValueError(
-            f"Message size exceeds the limit of {MESSAGE_LIMIT} bytes.")
+            f"message size exceeds the limit of {MESSAGE_LIMIT} bytes, please contact 1Password at support@1password.com or https://developer.1password.com/joinslack if you need help.")
     try:
         return core.invoke_sync(serialized_config)
     except Exception as e: