add missing docs for mixerclient filter config

mixer/v1/config/client/auth.proto

@@ -114,6 +114,7 @@ message JWT {
       string query = 2;
     }
   }
+  // Zero or more locations to search for JWT in an HTTP request.
   repeated Location locations = 6;
 
   // This field is specific for Envoy proxy implementation.
@@ -148,6 +149,8 @@ message EndUserAuthenticationPolicySpec {
   repeated JWT jwts = 2;
 }
 
+// EndUserAuthenticationPolicySpecReference identifies a
+// EndUserAuthenticationPolicySpec that is bound to a set of services.
 message EndUserAuthenticationPolicySpecReference {
   // REQUIRED. The short name of the
   // EndUserAuthenticationPolicySpec. This is the resource name

mixer/v1/config/client/client_config.proto

@@ -67,6 +67,8 @@ message TransportConfig {
   // The flag to disable report batch.
   bool disable_report_batch = 3;
 
+  // NetworkFailPolicy defines behavior when network connection
+  // failure occurs.
   enum NetworkFailPolicy {
     // If network fails, request is passed to the backend.
     FAIL_OPEN = 0;

mixer/v1/config/client/istio.mixer.v1.config.client.pb.html

@@ -189,6 +189,9 @@ <h2 id="EndUserAuthenticationPolicySpecBinding">EndUserAuthenticationPolicySpecB
 </section>
 <h2 id="EndUserAuthenticationPolicySpecReference">EndUserAuthenticationPolicySpecReference</h2>
 <section>
+<p>EndUserAuthenticationPolicySpecReference identifies a
+EndUserAuthenticationPolicySpec that is bound to a set of services.</p>
+
 <table class="message-fields">
 <thead>
 <tr>
@@ -702,6 +705,8 @@ <h2 id="JWT">JWT</h2>
 <td><code>locations</code></td>
 <td><code><a href="#JWT.Location">JWT.Location[]</a></code></td>
 <td>
+<p>Zero or more locations to search for JWT in an HTTP request.</p>
+
 </td>
 </tr>
 <tr id="JWT.jwks_uri_envoy_cluster">
@@ -893,6 +898,9 @@ <h2 id="QuotaSpecBinding">QuotaSpecBinding</h2>
 </section>
 <h2 id="QuotaSpecBinding.QuotaSpecReference">QuotaSpecBinding.QuotaSpecReference</h2>
 <section>
+<p>QuotaSpecReference uniquely identifies the QuotaSpec used in the
+Binding.</p>
+
 <table class="message-fields">
 <thead>
 <tr>
@@ -1187,6 +1195,9 @@ <h2 id="TransportConfig">TransportConfig</h2>
 </section>
 <h2 id="TransportConfig.NetworkFailPolicy">TransportConfig.NetworkFailPolicy</h2>
 <section>
+<p>NetworkFailPolicy defines behavior when network connection
+failure occurs.</p>
+
 <table class="enum-values">
 <thead>
 <tr>

mixer/v1/config/client/quota.proto

@@ -123,6 +123,8 @@ message QuotaSpecBinding {
   // REQUIRED. One or more services to map the listed QuotaSpec onto.
   repeated IstioService services = 1;
 
+  // QuotaSpecReference uniquely identifies the QuotaSpec used in the
+  // Binding.
   message QuotaSpecReference {
     // REQUIRED. The short name of the QuotaSpec. This is the resource
     // name defined by the metadata name field.