Include StopIterationAndWatermark in Stream*FilterCallbacks documentation (#5303)
Include StopIterationAndWatermark in Stream*FilterCallbacks documentation (#5303)

Signed-off-by: Kelly Campbell <fb048785ac5c4c7429f04180d4b21e5d09ead4ed@gmail.com>
eklitzke/envoy,lyft/envoy,lizan/envoy,envoyproxy/envoy-wasm,dnoe/envoy,envoyproxy/envoy,dnoe/envoy,lizan/envoy,jrajahalme/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy,istio/envoy,istio/envoy,eklitzke/envoy,lyft/envoy,envoyproxy/envoy-wasm,lyft/envoy,dnoe/envoy,lizan/envoy,lyft/envoy,jrajahalme/envoy,envoyproxy/envoy,istio/envoy,envoyproxy/envoy,dnoe/envoy,lyft/envoy,jrajahalme/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,istio/envoy,lizan/envoy,envoyproxy/envoy,istio/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lizan/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,eklitzke/envoy,lyft/envoy,eklitzke/envoy,envoyproxy/envoy,dnoe/envoy,lizan/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,istio/envoy,istio/envoy,jrajahalme/envoy