fix(secretmanager): update tag for create regional secret with tags sample

[durgesh-ninave-crest]

Description

• Update START and END tag of the create_regional_secret_with_tags sample

Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• secretmanager/src/create_regional_secret_with_tags.php:28, tag secretmanager_create_regional_secret_with_tags

You are about to delete 1 region tag.

• secretmanager/src/create_regional_secret_with_tags.php:28, tag secretmanager_regional_create_secret_with_tags

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[iennae]

You need to go about this by adding the region tag, updating docs to refer to the new region tag, and then deleting the old tag. Otherwise you break docs.

[iennae]

(I did check docs and I see this specific tag in use.)