docs(estimating-available-storage-space): format error on the quoting links

[ctesniere]

Fixes #SOME_ISSUE_NUMBER

Changes proposed in this pull request:

• format error on the quoting links https://developer.chrome.com/blog/estimating-available-storage-space/

Exemple with sw-precache link :

Version with Fix: https://deploy-preview-3824--developer-chrome-com.netlify.app/blog/estimating-available-storage-space/

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[AaronForinton]

Hi @ctesniere ! Thanks for submitting this fix, I'm merging it into the site now.