folder_block_ops: comment about getting rid of deCache
folder_block_ops: comment about getting rid of deCache

Issue: KBFS-2071

keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/kbfs,keybase/kbfs,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client