message: Superbuild readme fixes
diff: @@ -12,12 +12,13 @@ cmake [path/to/this/directory]
  cmake --build .
  ```
  -The resulting `install` directory will have everything in it.
  +The resulting `install` directory (or the one set with `CMAKE_INSTALL_PREFIX`)
  +will have everything in it, with one subdirectory per dependency.
  CMake options to note (all have sensible defaults):
  - `CMAKE_INSTALL_PREFIX` will be the root directory where everything gets installed.
  -- `NUM_BUILD_JOBS` sets the number given to `make -j` for parallel builds.
  +- `BUILD_JOBS` sets the number given to `make -j` for parallel builds.
  - `BUILD_EMBREE_FROM_SOURCE` set to OFF will download a pre-built version of Embree.
  - `BUILD_EMBREE_VERSION` determines which verison of Embree to pull down.
  - `BUILD_OIDN_FROM_SOURCE` set to OFF will download a pre-built version of OpenImageDenoise.
  