docs: add retry plugin arch docs and remove not-implemented-hide#4592

Merged

mattklein123 merged 5 commits intoenvoyproxy:masterfrom

snowp:implemented-retry

Oct 3, 2018

Commits on Oct 2, 2018

api: remove not-implemented-hide from retry plugins
Snow Pettersen
committed

Commits on Oct 3, 2018

docs: add retry plugin arch documentation
Snow Pettersen
committed
use code-block syntax
Snow Pettersen
committed
fix formating
Snow Pettersen
committed
wrap and address nits
Snow Pettersen
committed