api: fix extra space in link (#20880)

Signed-off-by: Xie Zhihao <zhihao.xie@intel.com>

Mirrored from https://github.com/envoyproxy/envoy @ 052f94ef7e42347366b1af31b2b7035d3c98463b

envoy/extensions/rbac/matchers/upstream_ip_port/v3/upstream_ip_port_matcher.proto

@@ -23,9 +23,8 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 // filter state before the matcher is executed by RBAC filter. The state should be saved with key
 // `envoy.stream.upstream_address` (See
 // :repo:`upstream_address.h<source/common/stream_info/upstream_address.h>`).
-// Also, See :repo:`proxy_filter.cc<
+// Also, See :repo:`proxy_filter.cc<source/extensions/filters/http/dynamic_forward_proxy/proxy_filter.cc>`
-// source/extensions/filters/http/dynamic_forward_proxy/proxy_filter.cc>` for an example of a
+// for an example of a filter which populates the FilterState.
-// filter which populates the FilterState.
 message UpstreamIpPortMatcher {
   // A CIDR block that will be used to match the upstream IP.
   // Both Ipv4 and Ipv6 ranges can be matched.