Refactor DocLink to use template literal for className

[MohamadSalman11]

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Describe the issue

The DocLink component currently stores className in a plain string:

const className =
  'text-primary hover:text-primary-light transition-colors duration-250 hover:border-primary-light border-b';

We can refactor this to use a template literal, keeping it in one line:

const className = `text-primary hover:text-primary-light transition-colors duration-250 hover:border-primary-light border-b`;