Storage space available for private chat rooms or direct chat when history is available

**Is your feature request related to a problem? Please describe.**

It is not clear how much space is available for private rooms/community.

**Describe the solution you'd like**
Please a FAQ saying regarding storage limits or recommendation.

According to some
https://matrix.to/#/!OGEhHVWSdvArJzumhm:matrix.org/$PcuerdgrxDuaKqTqsCdktzseH8lj6qhFqhm2PaDohSs?via=matrix.org&via=privacytools.io&via=mozilla.org

https://matrix.to/#/!OGEhHVWSdvArJzumhm:matrix.org/$YvG58MZYCRppYaAOKJh50YiNrM5tLiNfCC6Gi0hXkpk?via=matrix.org&via=privacytools.io&via=mozilla.org

there are afaik no concrete limits on how much storage you can use on matrix.org - it's best to treat it as a public service, ie. you can reasonably use it to whatever degree is necessary, just don't start using Matrix as a filesharing protocol :)

but yeah, with that usage, I wouldn't worry :) it's technically possible that matrix.org will remove old room history in the future, but I think that right now that doesn't happen yet, and text is small to store
(I think there are also no guarantees on how long old data will be kept around for, likewise)

**Describe alternatives you've considered**

Google search does not help finding correct answer.

**Additional context**

Start by reviewing the linked Matrix discussions and the site's existing FAQ or storage documentation. Document accurate guidance on storage limits and history retention for private rooms and direct chats; the work is done when the FAQ answers the question without implying unsupported guarantees.

Written by the indexing model from the issue text.