Improved Upgrade and Install docs, and fixed migration 0009 error reporting.
PEP8 fixes and double-spaces removed.
Fix docs bug where Sphinx was not formatting a link as expected.
Fixes identified through PR review. Thanks rbarlow!
Updating upgrade docs upgrade command.
Merge pull request #1001 from pulp/bmbouter-1100610

1100610 - Improved Upgrade and Install Docs, and Fixed Migration 0009 Error