Added missing docs on custom instructions (#729)

Closes: #725

Now the docs on custom instructions are complete

Author: aponcedeleonch

src/codegate/pipeline/cli/commands.py

@@ -476,4 +476,10 @@ def help(self) -> str:
             "  - *args*:\n"
             "    - `instructions`: The custom instructions to set\n"
             "  - **Usage**: `codegate custom-instructions -w <workspace_name> set <instructions>`\n"
+            "- `show`: Show custom instructions of the workspace\n"
+            "  - *args*: None\n"
+            "  - **Usage**: `codegate custom-instructions -w <workspace_name> show`\n"
+            "- `reset`: Reset the custom instructions of the workspace\n"
+            "  - *args*: None\n"
+            "  - **Usage**: `codegate custom-instructions -w <workspace_name> reset`\n"
         )