docs: fix non-rendered character in domains docs (#4399)
docs: fix non-rendered character in domains docs (#4399)

Description: * is being rendered out off of the docs. This fixes that.
Risk Level: low
Testing: generated docs locally.

Signed-off-by: Jose Nino <jnino@lyft.com>

Mirrored from https://github.com/envoyproxy/envoy @ 5c3169f863c4fc492f5a6a3220aef852451719ec

lyft/envoy-api,lyft/envoy-api,lyft/envoy-api