docs: Replacing HTML code with Markdown

docs: Fix PullResponse description
docs: Fix Pull description

PiperOrigin-RevId: 509846267

Author: Google APIs

google/pubsub/v1/pubsub.proto

@@ -517,9 +517,7 @@ service Subscriber {
     option (google.api.method_signature) = "subscription,ack_ids";
   }
 
-  // Pulls messages from the server. The server may return `UNAVAILABLE` if
-  // there are too many concurrent pull requests pending for the given
-  // subscription.
+  // Pulls messages from the server.
   rpc Pull(PullRequest) returns (PullResponse) {
     option (google.api.http) = {
       post: "/v1/{subscription=projects/*/subscriptions/*}:pull"
@@ -556,10 +554,10 @@ service Subscriber {
   }
 
   // Gets the configuration details of a snapshot. Snapshots are used in
-  // <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
-  // operations, which allow you to manage message acknowledgments in bulk. That
-  // is, you can set the acknowledgment state of messages in an existing
-  // subscription to the state captured by a snapshot.
+  // [Seek](https://cloud.google.com/pubsub/docs/replay-overview) operations,
+  // which allow you to manage message acknowledgments in bulk. That is, you can
+  // set the acknowledgment state of messages in an existing subscription to the
+  // state captured by a snapshot.
   rpc GetSnapshot(GetSnapshotRequest) returns (Snapshot) {
     option (google.api.http) = {
       get: "/v1/{snapshot=projects/*/snapshots/*}"
@@ -604,11 +602,10 @@ service Subscriber {
   }
 
   // Updates an existing snapshot. Snapshots are used in
-  // <a href="https://cloud.google.com/pubsub/docs/replay-overview">Seek</a>
-  // operations, which allow
-  // you to manage message acknowledgments in bulk. That is, you can set the
-  // acknowledgment state of messages in an existing subscription to the state
-  // captured by a snapshot.
+  // [Seek](https://cloud.google.com/pubsub/docs/replay-overview) operations,
+  // which allow you to manage message acknowledgments in bulk. That is, you can
+  // set the acknowledgment state of messages in an existing subscription to the
+  // state captured by a snapshot.
   rpc UpdateSnapshot(UpdateSnapshotRequest) returns (Snapshot) {
     option (google.api.http) = {
       patch: "/v1/{snapshot.name=projects/*/snapshots/*}"
@@ -700,7 +697,7 @@ message Subscription {
   // The approximate amount of time (on a best-effort basis) Pub/Sub waits for
   // the subscriber to acknowledge receipt before resending the message. In the
   // interval after the message is delivered and before it is acknowledged, it
-  // is considered to be <i>outstanding</i>. During that time period, the
+  // is considered to be _outstanding_. During that time period, the
   // message will not be redelivered (on a best-effort basis).
   //
   // For pull subscriptions, this value is used as the initial value for the ack
@@ -735,8 +732,8 @@ message Subscription {
   // minutes.
   google.protobuf.Duration message_retention_duration = 8;
 
-  // See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
-  // managing labels</a>.
+  // See [Creating and managing
+  // labels](https://cloud.google.com/pubsub/docs/labels).
   map<string, string> labels = 9;
 
   // If true, messages published with the same `ordering_key` in `PubsubMessage`
@@ -925,7 +922,7 @@ message PushConfig {
   // * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
   //
   // For example:
-  // <pre><code>attributes { "x-goog-version": "v1" } </code></pre>
+  // `attributes { "x-goog-version": "v1" }`
   map<string, string> attributes = 2;
 
   // An authentication method used by push endpoints to verify the source of
@@ -1130,7 +1127,8 @@ message PullRequest {
 // Response for the `Pull` method.
 message PullResponse {
   // Received Pub/Sub messages. The list will be empty if there are no more
-  // messages available in the backlog. For JSON, the response can be entirely
+  // messages available in the backlog, or if no messages could be returned
+  // before the request timeout. For JSON, the response can be entirely
   // empty. The Pub/Sub system may return fewer than the `maxMessages` requested
   // even if there are more messages available in the backlog.
   repeated ReceivedMessage received_messages = 1;
@@ -1316,9 +1314,9 @@ message CreateSnapshotRequest {
   // Required. User-provided name for this snapshot. If the name is not provided
   // in the request, the server will assign a random name for this snapshot on
   // the same project as the subscription. Note that for REST API requests, you
-  // must specify a name.  See the <a
-  // href="https://cloud.google.com/pubsub/docs/admin#resource_names"> resource
-  // name rules</a>. Format is `projects/{project}/snapshots/{snap}`.
+  // must specify a name.  See the [resource name
+  // rules](https://cloud.google.com/pubsub/docs/admin#resource_names). Format
+  // is `projects/{project}/snapshots/{snap}`.
   string name = 1 [
     (google.api.field_behavior) = REQUIRED,
     (google.api.resource_reference) = { type: "pubsub.googleapis.com/Snapshot" }
@@ -1340,8 +1338,8 @@ message CreateSnapshotRequest {
     }
   ];
 
-  // See <a href="https://cloud.google.com/pubsub/docs/labels"> Creating and
-  // managing labels</a>.
+  // See [Creating and managing
+  // labels](https://cloud.google.com/pubsub/docs/labels).
   map<string, string> labels = 3;
 }