Fix typos

[bedhanger]

The following changes since commit 7641fcf:

test-ls: discover socket mode like symlink mode (2017-03-26 17:21:24 -0500)

are available in the git repository at:

https://github.com/bedhanger/bup.git fix-typos

for you to fetch changes up to 797f238:

DESIGN: remove surplus ``relevant'' (2017-03-27 18:41:51 +0200)

[rlbdv]

Thanks for the help. In accordance with HACKING I've redirected this pull request to the list for discussion: https://groups.google.com/d/msg/bup-list/KEewu5TZgqk/5mHniQBBBAAJ

[rlbdv]

Thanks again -- pushed to master, minus the typo fix (see the list discussion).