SIP-03x: Fix `burn-block-height` keyword inside of `at-block`#203

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jbencin wants to merge 2 commits intostacksgov:mainfrom

jbencin:sip-03x-burn-block-height_in_at-block

Commits on Dec 5, 2024

First draft of SIP to correct `burn-block-height` keyword
jbencin
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Commits on Dec 6, 2024

Fill in "Specification"
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