docs: remove repeated word (#3600)
docs: remove repeated word (#3600)

Signed-off-by: Snow Pettersen <snowp@squareup.com>

Mirrored from https://github.com/envoyproxy/envoy @ 3c601a1cdec73818424c4d7fb76967e486b386e7

lyft/envoy-api,lyft/envoy-api,lyft/envoy-api