trivia: fix typo in README (#5883)
trivia: fix typo in README (#5883)

Remove a superfluous line of three back-ticks that caused improper formatting of the http_proxy section.

Signed-off-by: Larry West <d4383482628400015aa0e655ed34fda54431aa62@intuit.com>
envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,lizan/envoy,envoyproxy/envoy,dnoe/envoy,lizan/envoy,lizan/envoy,istio/envoy,eklitzke/envoy,lyft/envoy,istio/envoy,jrajahalme/envoy,lyft/envoy,lyft/envoy,dnoe/envoy,dnoe/envoy,envoyproxy/envoy-wasm,lizan/envoy,jrajahalme/envoy,jrajahalme/envoy,envoyproxy/envoy,istio/envoy,lizan/envoy,eklitzke/envoy,eklitzke/envoy,envoyproxy/envoy,istio/envoy,envoyproxy/envoy,eklitzke/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,lyft/envoy,eklitzke/envoy,dnoe/envoy,envoyproxy/envoy,lyft/envoy,istio/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,istio/envoy,lizan/envoy,envoyproxy/envoy,jrajahalme/envoy,eklitzke/envoy,istio/envoy,envoyproxy/envoy,envoyproxy/envoy,dnoe/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm