Note non-exact versions syntax installing outdated versions

[karlhorky]

Closes #1236 Closes #1114 Closes #940

Description:

As extensively documented in #1236 and #940, the non-exact aliases lts/*, *, current, latest, and 22 are slow to be upgraded, lagging several days behind the Node.js releases.

Let users know about this downside.

Related issue:

• #1236
• #1114
• #940

Check list:

• [x] Mark if documentation changes are required.
• [ ] Mark if tests were added or updated to cover the changes.