Document blockcache prefetch option (Misty Stanley-Jones)
Update apurtell's affiliation
Revert "Document blockcache prefetch option (Misty Stanley-Jones)"

This reverts commit 7f567830032f6dac027a6e0075987400c93c58f3.
HBASE-11752 Document blockcache prefetch option (Misty Stanley-Jones)
LoadIncrementalHFiles is not picking up the -D option