Revert "MINOR: Update ORCv1.md: Fix documentation about bitset in bloom filter section (#670)"
Revert "MINOR: Update ORCv1.md: Fix documentation about bitset in bloom filter section (#670)"

This reverts commit d7814a8a2d1600fc3856076eaf0617f7456e3af8.

apache/orc,omalley/orc,omalley/orc,apache/orc,omalley/orc,apache/orc,apache/orc,apache/orc,apache/orc,omalley/orc,omalley/orc,omalley/orc,apache/orc,apache/orc,omalley/orc