docs: add hyperlink for RFC3339 in bootstrap-tokens.md

[ChinoUkaegbu]

Description

Adds hyperlink for RFC3339

Issue

Closes: #47876

[linux-foundation-easycla]

• ✅login: ChinoUkaegbu / (2e7c1d4)

The committers listed above are authorized under a signed CLA.

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[dipesh-rawat]

Thanks!
Preview Page

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 9e51b61452b37a4c38640b082cee8c1ef3f82156

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dipesh-rawat

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[Shubham82]

/lgtm