release_process: mention need for encryption when sharing the pad
Originally created by @CyrilBrulebois on #16578 (Redmine)
This is the current section about the pad:
Bootstrap manual testing coordination:
1. Create a pad.
2. Copy the [[manual test suite|contribute/release_process/test]]
into it.
3. Send the pad URL to the usual testers (see `manual_testers.mdwn` in
the RM team's Git repository).
I think it’d be good to have an explicit mention of encryption here; I fumbled that part for 3.12* (and had to redo it to avoid possible interferences), which is the only reason why I didn’t make that same mistake again for 3.13…