[Docs] Replacing legacy ref string with ref variable

[Luccasoli]

Just rewriting ref props using ref variables.

[codecov]

Codecov Report

Merging #3375 (3d58253) into master (9055439) will not change coverage.
The diff coverage is n/a.

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  Coverage   97.56%   97.56%           
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  Files         123      123           
  Lines        8929     8929           
  Branches     3257     3257           
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  Hits         8712     8712           
  Misses        217      217           

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[ljharb]

I think it’d be better to add these examples instead of changing them, since both patterns are checked.

[ljharb]

Actually this is fine as-is

[Luccasoli]

Thanks, it's just that I was doing some reading and noticed this detail 😅