docs: update region tag names to match the convention

[ikuleshov]

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• Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> 🦕

[snippet-bot]

Here is the summary of possible violations 😱

There are 9 possible violations for not having product prefix.

• samples/snippets/quickstart.py:29, tag analyticsdata_quickstart
• samples/snippets/quickstart.py:43, tag analyticsdata_run_report_initialize
• samples/snippets/quickstart.py:49, tag analyticsdata_run_report
• samples/snippets/quickstart.py:59, tag analyticsdata_run_report_response
• samples/snippets/quickstart_json_credentials.py:30, tag analyticsdata_json_credentials_quickstart
• samples/snippets/quickstart_json_credentials.py:44, tag analyticsdata_json_credentials_initialize
• samples/snippets/quickstart_json_credentials.py:55, tag analyticsdata_json_credentials_run_report
• samples/snippets/quickstart_oauth2.py:30, tag analyticsdata_quickstart_oauth2
• samples/snippets/quickstart_oauth2.py:62, tag analyticsdata_initialize

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to add 9 region tags.

• samples/snippets/quickstart.py:29, tag analyticsdata_quickstart
• samples/snippets/quickstart.py:43, tag analyticsdata_run_report_initialize
• samples/snippets/quickstart.py:49, tag analyticsdata_run_report
• samples/snippets/quickstart.py:59, tag analyticsdata_run_report_response
• samples/snippets/quickstart_json_credentials.py:30, tag analyticsdata_json_credentials_quickstart
• samples/snippets/quickstart_json_credentials.py:44, tag analyticsdata_json_credentials_initialize
• samples/snippets/quickstart_json_credentials.py:55, tag analyticsdata_json_credentials_run_report
• samples/snippets/quickstart_oauth2.py:30, tag analyticsdata_quickstart_oauth2
• samples/snippets/quickstart_oauth2.py:62, tag analyticsdata_initialize

You are about to delete 9 region tags.

• samples/snippets/quickstart.py:29, tag google_analytics_data_quickstart
• samples/snippets/quickstart.py:43, tag google_analytics_data_initialize
• samples/snippets/quickstart.py:49, tag google_analytics_data_run_report
• samples/snippets/quickstart.py:59, tag google_analytics_data_run_report_response
• samples/snippets/quickstart_json_credentials.py:30, tag google_analytics_data_quickstart
• samples/snippets/quickstart_json_credentials.py:44, tag google_analytics_data_initialize
• samples/snippets/quickstart_json_credentials.py:55, tag google_analytics_data_run_report
• samples/snippets/quickstart_oauth2.py:30, tag google_analytics_data_quickstart
• samples/snippets/quickstart_oauth2.py:62, tag google_analytics_data_initialize

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[busunkim96]

Snippet bot seems to indicate the prefix needs to be registered. The prefix is used to associate snippets to products. go/code-snippets-101 covers how to do that. (If the bot info is just out of date please disregard).