StructuredLogHandler docstring documents project but parameter is project_id

[mariosnikolaou]

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Summary of the issue

Context
The docstring in StructuredLogHandler documents the parameter as project, but the actual keyword argument is project_id.

https://github.com/googleapis/google-cloud-python/blob/main/packages/google-cloud-logging/google/cloud/logging_v2/handlers/structured_log.py#L77

Expected Behavior:
Docstring for StructuredLogHandler matches keywork argument name project_id.

Actual Behavior:
Docstring for StructuredLogHandler uses project.

API client name and version

google-cloud-logging 3.16.0