Various minor ReST fixes needed in documentation
|Reported by:||Owned by:||Jacob|
|Cc:||Triage Stage:||Ready for checkin|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
I came across one of these (no trailing underscore on DATABASE_NAME link in docs/legacy_databases.txt) in the course of working on something else, then went grepping for similar cases. I *think* these are all needed corrections, but I wasn't entirely positive about house style in a couple spots.