Fix doc for riakc_pb_socket:delete_search_index/2 & riakc_pb_socket:delete_search_index/3
Merge pull request #197 from HashNuke/fix-delete-search-index-doc

Fix doc for riakc_pb_socket:delete_search_index/2 & riakc_pb_socket:delete_search_index/3

Reviewed-by: seancribbs