Either support Fedora or remove information of support from web page

# What is wrong
On pages listed below Fedora is listed as Linux distribution that works out of the box but when I run step one I am getting following message:
```sh
Detected operating system as fedora/40.
Unfortunately, your operating system distribution and version are not supported by this script.

Please contact us via https://www.citusdata.com/about/contact_us with any issues.
```
I tested following script on two different amd64 machines. One was running Fedora 40 worskstation and second one Fedora 40 Server.

https://www.citusdata.com/download/
https://docs.citusdata.com/en/stable/installation/multi_node_rhel.html#post-enterprise-rhel

# Suggested action
Please either support Fedora linux distribution or remove mentions from listed sites that Fedora is supported

Start with the download page and the RHEL installation page linked in the issue, then compare their Fedora support wording with the reported installation-script error for Fedora 40. Done means the published support information accurately matches what the script supports, either by correcting the documentation or removing the Fedora claims.

Written by the indexing model from the issue text.