Update INSTALL.md

Author: ooreilly

INSTALL.md

@@ -89,7 +89,7 @@ $ cmake --install BUILD_DIR --prefix INSTALL_DIR
 During installation, the [Env Modules](Env_Modules) file `INSTALL_DIR/modulefiles/occa` is generated. When this module is loaded, paths to the installed `bin`, `lib`, and `include` directories are appended to environment variables such as `PATH` and `LD_LIBRARY_PATH`. 
 To make use of this module, add the following to your `.modulerc` file
 ```
-module use -a INSTALL_DIR/modulfiles
+module use -a INSTALL_DIR/modulefiles
 ```
  then at the commandline call
 ```shell
@@ -121,4 +121,4 @@ In the case of a downstream library, linking OCCA using the  `PUBLIC` specifier
 > Do you use OCCA on Windows? Help other Windows users by contributing to the documentation here!
 
 [CMake]: https://cmake.org/
-[Env_Modules]: https://modules.readthedocs.io/en/latest/index.html
+[Env_Modules]: https://modules.readthedocs.io/en/latest/index.html