docs: modify the project ID pattern in comment for VmImage (#162)

* docs: modifies the project ID pattern in comment for Workbench environment

PiperOrigin-RevId: 446581791

Source-Link: googleapis/googleapis@2402963

Source-Link: googleapis/googleapis-gen@df2549f
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZGYyNTQ5ZjYyOTY3ZDIyZWJjODAzZmU2MGNkNTA2OWRjZWZiOTI0MCJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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

google/cloud/notebooks_v1/types/environment.py

@@ -115,7 +115,7 @@ class VmImage(proto.Message):
     Attributes:
         project (str):
             Required. The name of the Google Cloud project that this VM
-            image belongs to. Format: ``projects/{project_id}``
+            image belongs to. Format: ``{project_id}``
         image_name (str):
             Use VM image name to find the image.