doc: update crypo Certficate class.
update the dead link to documentation. add a link to mozilla developper documentation because W3C delete the reference to this element.
add a note to inform element is deprecated since HTML 5.2.
Fixes: https://github.com/nodejs/node/issues/18662
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines