docs: add gateway-error as one of retry-on policies#415

Merged

mattklein123 merged 3 commits intoenvoyproxy:masterfrom

dio:add-gateway-error-retry-policy

Jan 14, 2018

Commits on Jan 12, 2018

Add gateway error retry-on policy
Dhi Aurrahman
committed
Rephrase the gateway-error retry-on policy.
Dhi Aurrahman
committed

Commits on Jan 13, 2018

Simplify the gateway-error policy description
Dhi Aurrahman
committed