chore(github): remove redundant markdown body (#76187)
## Description
Let's see the
[docs_report.yml](https://github.com/vercel/next.js/blob/canary/.github/ISSUE_TEMPLATE/4.docs_report.yml)
issue template.
https://github.com/vercel/next.js/blob/0c946eb20dea56211bf15940bf406fe82d31c613/.github/ISSUE_TEMPLATE/4.docs_report.yml?plain=1#L6-L14
These markdown area can be combined into one markdown.
```yml
- type: markdown
attributes:
value: |
Before opening a new documentation issue, is this something you can help us with? Your contributions are welcomed and appreciated. See our [Docs Contribution Guide](https://nextjs.org/docs/community/contribution-guide) to learn how to edit the Next.js docs.
If you are reporting about an documentation request, please open it in our [discussions](https://github.com/vercel/next.js/discussions/new?category=ideas) instead.
Thank you for helping us update our docs!
```
It's more readable and no display changes.
CC: @samcx
Co-authored-by: Sam Ko <sam@vercel.com>
