doc: update charter section on voting (#1636)

* doc: update charter section on voting

* lint

Author: aduh95

TSC-Charter.md

@@ -127,9 +127,11 @@ The TSC voting members follow a [Consensus Seeking][] decision making model.
 When an agenda item has appeared to reach a consensus the moderator will ask
 "Does anyone object?" as a final call for dissent from the consensus.
 
-For all votes, a simple majority of all TSC voting members for, or against, the
-issue wins. A TSC voting member may choose to participate in any vote through
-abstention.
+For all votes, the winning candidate option is the one that wins a simple
+majority of all TSC voting members in every head-to-head election against each
+of the other candidates. A TSC voting member may choose to participate in any
+vote through abstention. As long as a vote is open, TSC voting members' choices
+must not be disclosed, to avoid influencing other voting members.
 
 All changes to this charter must be approved by the CPC.