docs: update CHANGELOG.md readme to include entry separators (#43799)

Add `<!-- CHANGELOG SPLIT MARKER -->` between changelog entries to match the expected
format of the CHANGELOG.md file for the repository tooling.

PR Close #43799
This commit is contained in:
Joey Perrott 2021-10-11 12:18:04 -07:00 committed by Andrew Scott
parent 16e5a314b1
commit 325c6e4e7a

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