New forum syntax guide & details about Trust levels

General Discussion
188 
<details><summary>title</summary>

This is a message
</details>

<!-- Same as the above but starts as "open" -->

<details open><summary>title</summary>

This message is visible, click "title" above this message to hide it.
</details>

Default:

title

This is a message

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With open attribute:

title

This message is visible, click “title” above this message to hide it.

More detailed syntax guide found here:

#shameless-plug