[EEG Uploader] User messaging and Documentation update

[laemtl]

Documentation patch to resolve #9293.

Let users and admins know that they will encounter a known issue (#9191), not a bug with their setup:

This does this by:

• Adding text visible to Users at the top of the module
• Adding README message
• Adding Help text note for users

This does not resolve #9191, but it clarifies the state for LORIS users.

[jeffersoncasimir]

Text approved and works as expected!

[driusan]

@laemtl since I can't update the commit message with the merge queue on this branch can you please update the pull request description to describe the change in a way that's suitable for a commit message. (Third person, no images, no checklists, describe what's being done and why.)

[christinerogers]

@laemtl since I can't update the commit message with the merge queue on this branch can you please update the pull request description to describe the change in a way that's suitable for a commit message. (Third person, no images, no checklists, describe what's being done and why.)

@driusan just made these changes. Ready for your re-review to merge.

please tag @christinerogers and @laemtl if you see any reason not to merge before the Loris meeting - thanks!

[driusan]

Jefferson already approved it but there was a commit added since then, need to re-approve to trigger merge queue.