[openstreetmap/openstreetmap-website] Improve markdown guide language (Issue #3967)

[Wille Marcel]

### Problem

The markdown reference in the New Diary page is not very friendly.

![image](https://user-images.githubusercontent.com/666291/224397944-0c7242d3-f45a-4bf8-a0fd-fd1d5eb74fc4.png)

Probably many users don't know what "Parsed with kramdown" means

### Description

We could improve the language, doing something like:
![image](https://user-images.githubusercontent.com/666291/224398884-e1c4c8ed-ce68-4dbe-92da-5ee76820e61f.png)


### Screenshots

_No response_

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