docs: Fix formatting for subnetwork field pattern (#190)

* docs: Fix formatting for subnetwork field pattern

PiperOrigin-RevId: 492232435

Source-Link: googleapis/googleapis@fcf8211

Source-Link: https://github.com/googleapis/googleapis-gen/commit/ce62e52831e4e477000785fcc93a9ab42a28dc8a
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiY2U2MmU1MjgzMWU0ZTQ3NzAwMDc4NWZjYzkzYTlhYjQyYTI4ZGM4YSJ9

* 🦉 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/metastore_v1/types/metastore.py

@@ -437,7 +437,7 @@ class Consumer(proto.Message):
                 the subnet's primary range. The subnet is specified in the
                 following form:
 
-                \`projects/{project_number}/regions/{region_id}/subnetworks/{subnetwork_id}
+                ``projects/{project_number}/regions/{region_id}/subnetworks/{subnetwork_id}``
 
                 This field is a member of `oneof`_ ``vpc_resource``.
             endpoint_uri (str):