fix typo

Signed-off-by: Aleh Suprunovich <br@ahlamon.org>
Merge pull request #183 from metabr/fix-typo

fix typo
Fix markup for index item "http-backend"
Merge pull request #184 from harupong/fix-index-markup

Fix markup for index item "http-backend"
Update recommended diagram slice size
Merge remote-tracking branch 'upstream/master'

Conflicts:
	CONTRIBUTING.md