Description of problem: In the "Understanding Encryption" section of the F9 install guide, the passphrase text contains a reference to the section on setting the root password. Please -- pass*phrase* is not the same thing as pass*word*. This is actually encouraging users to create weak (single word) passphrases. There should instead be some text that talks about passphrases. One example of a passphrase discussion can be found here: https://fedoraproject.org/wiki/Docs/Drafts/DiskEncryptionUserGuide#Choosing_a_Good_Passphrase
So the current Understanding Encryption section does reference passphrase. I did change the current wording to more closely match what is in the DEUG. To make the encryption effective, choose a good passphrase. Note the use of the term "passphrase", as opposed to the term "password". This is intentional. Utilizing a phrase containing multiple words increases the security of your data. I made the changes in commit dbac459 - which is still local to me at this time, I'll close the bug when I push up later today.
Point of style order before you push -- punctuation goes inside quotation marks, unless doing so would change the sense of the quoted material. So for example, you would indicate the password "f00b4r", but you would talk about a generic "passphrase."
Fixed the problem I introduced that was pointed out in Comment 2. Commit 685c72a
pushed both commits thus closing this ticket.