[FR] Fix link in mutual-transport-layer-security.md

[jeanlouisferey]

Correction of a dead link

Describe your changes

Updated the link with the good filename

Related issue number or link (ex: resolves #issue-number)

resolves #2783

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[sestegra]

@jeanlouisferey Thank you for the fix.
🚀 LGTM

[guillaumebernard84]

LGTM 🚀