feat(plugins)(datadog): changelog-entry to add 'route tag name' to configurable options

[tysoekong]

Description

Updated datadog plugin changelog to add 'route tag name' to configurable options, from 3.9.x (predicted).

Testing instructions

Preview link:

Checklist

• [x] Review label added
• [x] Conditional version tags added, if applicable.

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[lena-larionova]

LGTM, just not merging for now since this page doesn't have version tags.

[tysoekong]

@lena-larionova What do I need to change for version tags? I don't think there's any versioned content other than the changelog

[lena-larionova]

We'll pull this in automatically whenever the feature gets merged in a future release.