[DOCS] Add Feng Zhang to PMC and Dewey Dunnington as Committer on contributor.md
#2433
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Did you read the Contributor Guide?
Is this PR related to a ticket?
[DOCS] my subjectWhat changes were proposed in this PR?
Updated the PMC list
How was this patch tested?
https://home.apache.org/phonebook.html?uid=fengzhang
https://home.apache.org/phonebook.html?uid=paleolimbot
Did this PR include necessary documentation updates?