[OnWeek] Fix Vale rule warnings in manage-data/data-store

[natasha-moore-elastic]

This PR is part of the OnWeek project about fixing Vale rule violations in docs-content.

It fixes warnings in the manage-data/data-store folder.

Assisted by Cursor.

[github-actions]

🔍 Preview links for changed docs

• manage-data/data-store/data-streams.md
• manage-data/data-store/data-streams/failure-store-recipes.md
• manage-data/data-store/data-streams/failure-store.md
• manage-data/data-store/data-streams/run-downsampling.md
• manage-data/data-store/mapping.md
• manage-data/data-store/mapping/define-runtime-fields-in-search-request.md
• manage-data/data-store/mapping/dynamic-templates.md
• manage-data/data-store/mapping/explore-data-with-runtime-fields.md
• manage-data/data-store/mapping/index-runtime-field.md
• manage-data/data-store/mapping/map-runtime-field.md

More links …

• manage-data/data-store/mapping/retrieve-runtime-field.md
• manage-data/data-store/mapping/runtime-fields.md
• manage-data/data-store/near-real-time-search.md
• manage-data/data-store/perform-index-operations.md
• manage-data/data-store/text-analysis.md
• manage-data/data-store/text-analysis/anatomy-of-an-analyzer.md
• manage-data/data-store/text-analysis/index-search-analysis.md

[kilfoyle]

LGTM! 🦘