minor doc improvements (#5189)
minor doc improvements (#5189)

Signed-off-by: Rama Chavali <40109507d7c707c570c476fc1522e2d26df7f15e@salesforce.com>
istio/envoy,envoyproxy/envoy,envoyproxy/envoy,lizan/envoy,lyft/envoy,envoyproxy/envoy-wasm,lizan/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,istio/envoy,dnoe/envoy,jrajahalme/envoy,lizan/envoy,eklitzke/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy,lyft/envoy,jrajahalme/envoy,lizan/envoy,envoyproxy/envoy-wasm,lizan/envoy,istio/envoy,dnoe/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,dnoe/envoy,eklitzke/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,envoyproxy/envoy-wasm,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,jrajahalme/envoy,lyft/envoy,envoyproxy/envoy-wasm,istio/envoy,istio/envoy,jrajahalme/envoy,envoyproxy/envoy,dnoe/envoy,eklitzke/envoy,istio/envoy,lyft/envoy,istio/envoy,dnoe/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,eklitzke/envoy,lizan/envoy,envoyproxy/envoy,eklitzke/envoy