Update docs/hpc/14_tutorial_apptainer/02_running_containers.mdx

Co-authored-by: Robert Young <robert.jay.young@gmail.com>

Author: Amanda-dong

docs/hpc/14_tutorial_apptainer/02_running_containers.mdx

@@ -39,7 +39,7 @@ Depending on how the image was built, this command may produce output, launch an
 
 The important point is that with `apptainer run`, Apptainer executes the default action defined by the image creator.
 
-In cases we want to run a specific command, use `apptainer exec`.
+To run a specific command, use `apptainer exec`.
 
 ## Running Specific Commands Within a Container