docs: Fix the confusing word in http3 upsteam documents (#17481)
docs: Fix the confusing word in http3 upsteam documents (#17481)

Signed-off-by: Le Yao <79e6b44607aff8e2186a32618b9d2ffbd8688fbb@intel.com>

envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy