chore: update sample directory link (#329)

Fix 404 link on samples

Co-authored-by: Jeffrey Rennie <rennie@google.com>

Source-Link: googleapis/synthtool@270f3ab
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:b72db6cab4d9e5890bff28d9175af940ba4ed75fbb28563c313a8835a31f7b19

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

core/promisify/.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest
-  digest: sha256:e08f9a3757808cdaf7a377e962308c65c4d7eff12db206d4fae702dd50d43430
-# created: 2023-08-03T18:46:14.719706948Z
+  digest: sha256:b72db6cab4d9e5890bff28d9175af940ba4ed75fbb28563c313a8835a31f7b19
+# created: 2023-09-11T16:43:24.412852862Z

core/promisify/README.md

@@ -79,7 +79,7 @@ installed as a dependency when you install other `@google-cloud` packages.
 
 ## Samples
 
-Samples are in the [`samples/`](https://github.com/googleapis/nodejs-promisify/tree/main/samples) directory. Each sample's `README.md` has instructions for running its sample.
+Samples are in the [`samples/`](https://github.com/googleapis/nodejs-promisify/tree/main/packages/google-cloud-functions/samples) directory. Each sample's `README.md` has instructions for running its sample.
 
 | Sample                      | Source Code                       | Try it |
 | --------------------------- | --------------------------------- | ------ |