Fix outdated maintainers list (facebook#32102)

I made a few mistakes while adding the initial list
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[//]: # (BEGIN SAPLING FOOTER)
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* facebook#32103
* __->__ facebook#32102

Author: poteto

MAINTAINERS

@@ -1,5 +1,4 @@
 acdlite
-bvaughn
 eps1lon
 gaearon
 gnoff
@@ -13,7 +12,9 @@ kassens
 lunaleaps
 mattcarrollcode
 mofeiZ
+mvitousek
 noahlemen
+pieterv
 poteto
 rickhanlonii
 sebmarkbage