Update PMC management instructions to follow new ASF process #16417
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Which issue does this PR close?
Rationale for this change
The ASF process for inviting new PMC members has been updated, notably sending an email notice to the board is no longer required.
What changes are included in this PR?
Let's update the DataFusion specific cookbook to match the updated process
Are these changes tested?
Are there any user-facing changes?
Documentation only changes