Translate Vale style fix to Spanish expandables.mdx

[mintlify-development]

Summary

• Updated es/components/expandables.mdx to match the Vale style fix from PR Fix Vale style warnings across documentation #4036
• Changed redundant 'Los desplegables son especialmente útiles' to 'Son especialmente útiles' to avoid repetition (matching English change from 'Expandables are particularly useful' to 'They are particularly useful')

The French and Chinese translations already had the correct phrasing.

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Note

Low Risk
Low risk documentation-only wording change with no behavioral or code impact.

Overview
Updates the Spanish expandables.mdx intro sentence to avoid repetition by changing “Los desplegables son especialmente útiles…” to “Son especialmente útiles…”, matching the style fix applied in other locales.

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