docs: Update 2021-09-29-secure-bootstrap.md#30243

Merged

ti-chi-bot merged 3 commits intopingcap:masterfrom JameyWoo:patch-1

Nov 30, 2021

+1-1

Commits on Nov 29, 2021

Commits on Nov 30, 2021

Merge branch 'master' into patch-1
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