Fix JSDoc grammar typo: 'returns a undefined' → 'returns undefined'

[driphtyio]

Summary

Fixes a grammar typo in the JSDoc for SymbolConstructor.keyFor.

• @returns a undefined → @returns undefined

Changes

• src/lib/es2015.symbol.d.ts: One-line JSDoc grammar fix

This is a non-disruptive lib.d.ts change in the accepted category per the repository's contribution policy.

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