Update Stackdriver wording in docstrings

[Jasminekaur2005]

Updated Stackdriver wording in docstrings to the newer Google Operations / Cloud Monitoring naming. No functional code changes.

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[shahar1]

Thanks for your contribution!
As long as we don't fully deprecate the "Stackdriver" naming (as #61009 aims to do), we'll still need to refer to the old name it in the docs to avoid confusion with the file names, i.e., Cloud Monitoring (formerly: Stackdriver).
Please take care of the above in your changes and I'll approve and merge it.

[Jasminekaur2005]

@shahar1 i'll keep that in mind this is my first time contributing i apologize for this