Update allow-users-to-change-passwords.md

[nanowrit]

Proposing these changes to make this chapter more congruent with the core chapters of the guide.

Also, I have a replacement screenshot for the settings page with both the billing form and the change email/password buttons. Please see my comment for the screen shot.

[nanowrit]

Please see attached screen shot for the settings page with both the billing form and the change email/password buttons.

[jayair]

Hmm this one is a bit of a bigger change, since we need to change the attached repos as well. I think for now it might be better to add a note in this chapter saying that we are using a blank settings page instead of the existing one?