Merge branch 'jn/notes-doc'

* jn/notes-doc:
Documentation/notes: nitpicks
Documentation/notes: clean up description of rewriting configuration
Documentation/notes: simplify treatment of default display refs
Documentation/log: add a CONFIGURATION section
Documentation/notes: simplify treatment of default notes ref
Documentation/notes: add configuration section
Documentation/notes: describe content of notes blobs
Documentation/notes: document format of notes trees

diff --cc Documentation/config.txt
Simple merge

diff --cc Documentation/git-log.txt
Simple merge