fix: openTelemetry doc fails to generate for #1185 (#1200)

It seems that the file rename make the doc generation fails, here is a README only PR to fix it
(I run locally npm run docs-test)

- [x] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/nodejs-pubsub/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)

Fixes #1185 🦕

Author: maxday

handwritten/pubsub/README.md

@@ -142,7 +142,7 @@ Samples are in the [`samples/`](https://github.com/googleapis/nodejs-pubsub/tree
 | Listen For Messages | [source code](https://github.com/googleapis/nodejs-pubsub/blob/master/samples/listenForMessages.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listenForMessages.js,samples/README.md) |
 | Listen For Messages With Custom Attributes | [source code](https://github.com/googleapis/nodejs-pubsub/blob/master/samples/listenWithCustomAttributes.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listenWithCustomAttributes.js,samples/README.md) |
 | Modify Push Configuration | [source code](https://github.com/googleapis/nodejs-pubsub/blob/master/samples/modifyPushConfig.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/modifyPushConfig.js,samples/README.md) |
-| OpenTelemetry Tracing | [source code](https://github.com/googleapis/nodejs-pubsub/blob/master/samples/opentelemetryTracing.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/opentelemetryTracing.js,samples/README.md) |
+| OpenTelemetry Tracing | [source code](https://github.com/googleapis/nodejs-pubsub/blob/master/samples/openTelemetryTracing.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/openTelemetryTracing.js,samples/README.md) |
 | Publish Batched Messages | [source code](https://github.com/googleapis/nodejs-pubsub/blob/master/samples/publishBatchedMessages.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishBatchedMessages.js,samples/README.md) |
 | Publish Message | [source code](https://github.com/googleapis/nodejs-pubsub/blob/master/samples/publishMessage.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishMessage.js,samples/README.md) |
 | Publish Message With Custom Attributes | [source code](https://github.com/googleapis/nodejs-pubsub/blob/master/samples/publishMessageWithCustomAttributes.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishMessageWithCustomAttributes.js,samples/README.md) |