doc/governance: updates based on 2024q4 election

doc/governance: updates based on 2024q4 election

https://vote.heliosvoting.org/helios/elections/e03494ce-e04c-41d0-bb05-ec5ccc632ce4/view

Question #1
    Update election requirements for Ceph Executive Council Elections?
        Remove "ranked-choice" requirement	13
        Keep "ranked-choice" requirement (no change)	16

Question #2
    Require periodic elections in governance charter?
        No (no change)	8
        Annual	15
        Semi-annual	3
        Quarterly	2

Question #3
    Update the Ceph Executive Council term length?
        Change to 3 years	14
        Keep 2 years (no change)	14

Question #4
    Amend governance document to require a supermajority of votes for amendments to the governance model? The current requirement is a simple majority.
        Require a supermajority	20
        Require a simple majority (no change)	9

Question #5
    Clarify "supermajority" and "majority" election requirements?
        Of members voting on a given question (abstaining does not bias the vote)	18
        Of members voting on the election (abstaining is an implicit "no")	6
        Of members in the CSC	3

Signed-off-by: Patrick Donnelly <pdonnell@ibm.com>