Add omniperf suffix to MOD_INSTALL_PATH in docs (#414)

If we don't add the suffix omniperf to the install path then the subsequent instruction of module load omniperf will not work

Signed-off-by: coleramos425 <colramos@amd.com>

[ROCm/rocprofiler-compute commit: 68e2cf0973]

projects/rocprofiler-compute/docs/install/core-install.rst

@@ -142,7 +142,7 @@ Install from source
          cd build
          cmake -DCMAKE_INSTALL_PREFIX=${INSTALL_DIR}/{{ config.version }} \
                  -DPYTHON_DEPS=${INSTALL_DIR}/python-libs \
-                 -DMOD_INSTALL_PATH=${INSTALL_DIR}/modulefiles ..
+                 -DMOD_INSTALL_PATH=${INSTALL_DIR}/modulefiles/omniperf ..
 
          # install
          make install