docs: fix indentation error in the developer guide

docs/developer_guide/index.md

@@ -26,6 +26,7 @@ The source code is thoroughly documented and well-commented, making it an enjoya
     hatch env create docs
     hatch env create test
     ```
+
 6. To use the virtual environments, either
 
     - Activate one of the virtual environments with the following command.
@@ -70,11 +71,11 @@ These commands are defined in the [`pyproject.toml`](https://github.com/sinaatal
 
 - Format the code with [Black](https://github.com/psf/black):
     ```bash
-  hatch run format
+    hatch run default:format
     ```
 - Lint the code with [Ruff](https://github.com/astral-sh/ruff):
     ```bash
-    hatch run lint
+    hatch run default:lint
     ```
 - Run the tests:
     ```bash