README typo.

Author: hctorres

swm_AMReX/README.md

@@ -29,7 +29,7 @@ Based on the NCAR SWM mini-app found [here](https://github.com/NCAR/SWM).
 
 ## Convenience Script
 - [run_local.sh](./run_local.sh)
-    - The environment variable SWM_AMREX_ROOT must be set to use this script. It should point to the top level of this directoy. This script will: 
+    - The environment variable SWM_AMREX_ROOT must be set to use this script. It should point to this directoy. This script will: 
         - Build. 
         - Create a subdirectory called SWM_AMREX_ROOT/run_dir if it does not already exist. 
         - Run and postprocess in that subdirectory.