Fix Guided Mat Mult ReadMe

Signed-off-by: Ong, Frankie Wei Quan <frankie.wei.quan.ong@intel.com>

Author: intelfong326

DirectProgramming/Fortran/guided_matrix_mul_OpenMP/README.md

@@ -106,7 +106,7 @@ Note that:
    ```
 4. Run the program.
    ```
-   01_mm_sequential.exe
+   01_mm_CPU_sequential.exe
    ```
 
 ### Example Sequential Program Output