Use of colon and line break in doc string breaks formatting in IntelliSense

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### Summary of the issue

**Context**
[These lines](https://github.com/googleapis/google-cloud-python/blob/4f87fe6583a44d0de55a951a51b00e95d6eceee0/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1/services/secret_manager_service/client.py#L617-L621) cause bad formatting of doc string in IntelliSense hints in IDE. This is due to the use of a `:` and a line break.

**Expected Behavior:**
Readable doc string information within IDE tool tip

**Actual Behavior:**
Inconsistent text formatting.

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