Updated Contributing Code (markdown)

Contributing-Code.md

@@ -2,38 +2,38 @@ This document describes requirements and best practices for contributing code (P
 
 If you have/find any concern/problem with this document, **DO NOT** create an issue in this repository, instead, please go to [Gogs Discussion](https://discuss.gogs.io/) and discuss.
 
-### Before you start
+## Before you start
 
-#### Those we do accept
+### Those we do accept
 
 1. Typos in template files or code comments.
 2. Bug fixes or feature implementations (be sure to discuss first).
 2. Issues that are labeled as [help wanted](https://github.com/gogs/gogs/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22) and [good first issue](https://github.com/gogs/gogs/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22) (be sure to claim first to prevent two people work on the same thing!).
 
-#### Those we do not accept
+### Those we do not accept
 
 1. We do not accept pull requests for locale files (`conf/locale_xx-XX.ini` files), please read the [guide](https://gogs.io/docs/features/i18n), except for `conf/locale_en-US.ini` file.
 2. Docker compose file.
 3. Pull request with a lot of changed files; we have rights to deny any pull requests that we considered too large to take time to review.
 
-#### Make a claim
+### Make a claim
 
 Write a comment to the corresponding thread to claim you're working on it, so people wouldn't have conflict on what they're working on.
 
-### Coding guidelines
+## Coding guidelines
 
 1. Please follow the Sourcegraph's [Go style guide](https://about.sourcegraph.com/handbook/engineering/go_style_guide).
 2. All `.go` files must be formatted with `gofmt`.
 3. All `.less` and `.tmpl` files must use **1 tab** as indention.
 4. **NO** direct modifications to `.css` files, `.css` files are all generated by `.less` files. Normally you can achieve this by executing `make less`.
 
-### For UI changes
+## For UI changes
 
 1. Please use standard [Semantic UI](http://semantic-ui.com/) classes as much as possible to avoid editing `.less` files.
 2. Please attach corresponding screenshots for all representative pages that is affected by your changes.
 3. If you need to add new locale strings, you **ONLY** need to care about `conf/locale_en-US.ini` file, **DO NOT** touch all the other locales files.
 
-### Final checks
+## Final checks
 
 1. There is **no guarantees** that your pull request will be merged.
 2. Please expect code review being **VERY** strict, be prepared for benefiting future of this project.