update image driver documentation
# VIC Image Driver
-The Image Driver represents the modern implementation of the VIC model. It uses netCDF I/O, runs in a time-before-space evaluation order, and uses MPI for parallel processing.
+The Image Driver represents the modern implementation of the VIC model. It uses netCDF I/O, runs in a space-before-time evaluation order, and uses MPI for parallel processing.
## Modeling the Land Surface using VIC
1. [VIC Input Files](Inputs.md)
