docs: release note cleanup for 1.7 (#3653)
docs: release note cleanup for 1.7 (#3653)

Risk Level: n/a
Testing: n/a
Docs Changes: release notes cleaned up.

Signed-off-by: Alyssa Wilk <b9253d1ec9cc3e9d2aab68d288ba3dab3452adf6@chromium.org>

istio/envoy,eklitzke/envoy,istio/envoy,dnoe/envoy,lizan/envoy,envoyproxy/envoy,jrajahalme/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,envoyproxy/envoy,dnoe/envoy,jrajahalme/envoy,envoyproxy/envoy,lyft/envoy,istio/envoy,eklitzke/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lyft/envoy,lizan/envoy,lizan/envoy,envoyproxy/envoy,jrajahalme/envoy,envoyproxy/envoy,lizan/envoy,lizan/envoy,istio/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,dnoe/envoy,eklitzke/envoy,eklitzke/envoy,dnoe/envoy,lyft/envoy,jrajahalme/envoy,lizan/envoy,istio/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,jrajahalme/envoy,dnoe/envoy,lyft/envoy,envoyproxy/envoy,istio/envoy,istio/envoy