Improved readability in CONTRIBUTING.md (#4240)

Co-authored-by: Engel Nyst <[email protected]>

CONTRIBUTING.md

@@ -8,16 +8,16 @@ There are many ways that you can contribute:
 
 1. **Download and use** OpenHands, and send [issues](https://github.com/All-Hands-AI/OpenHands/issues) when you encounter something that isn't working or a feature that you'd like to see.
 2. **Send feedback** after each session by [clicking the thumbs-up thumbs-down buttons](https://docs.all-hands.dev/modules/usage/feedback), so we can see where things are working and failing, and also build an open dataset for training code agents.
-3. **Improve the Codebase** by sending PRs (see details below). In particular, we have some [good first issue](https://github.com/All-Hands-AI/OpenHands/labels/good%20first%20issue) issues that may be ones to start on.
+3. **Improve the Codebase** by sending PRs (see details below). In particular, we have some [good first issues](https://github.com/All-Hands-AI/OpenHands/labels/good%20first%20issue) that may be ones to start on.
 
 ## Understanding OpenHands's CodeBase
 
 To understand the codebase, please refer to the README in each module:
 - [frontend](./frontend/README.md)
 - [evaluation](./evaluation/README.md)
 - [openhands](./openhands/README.md)
-    - [agenthub](./openhands/agenthub/README.md)
-    - [server](./openhands/server/README.md)
+   - [agenthub](./openhands/agenthub/README.md)
+   - [server](./openhands/server/README.md)
 
 
 When you write code, it is also good to write tests. Please navigate to the `tests` folder to see existing test suites.