Fixing weird behaviour with mbps when specified twice in the list with different capitalization

Author: rohennes

.vale/styles/config/vocabularies/OpenShiftDocs/accept.txt

@@ -17,8 +17,7 @@ gpspipe
 hyperthreads?
 KPIs?
 linuxptp
-Mbps
-MBps
+[Mm][Bb]ps
 Mellanox
 MetalLB
 NICs?