[1.7.x] Corrected some indentation in docs/topics/auth/default.txt.

Backport of 34f4fd7024 from master
[1.7.x] Fixed #22792 -- Updated checks for list_display_links in model admin

Backport of d8f19bb3b6 from master
[1.7.x] Fixed #22770 -- Removed create_superuser from post_migrate signals.

Moved logic to syncdb command for backwards compatibility.

Backport of 93d05536fd from master
[1.7.x] Fixed #22801 -- Added 'www.' to diveintopython.net links

Backport of f97c53c098 from master