EZESC-1933 -Update wordcount.yaml to remove duplicate volume

[abe-hpe]

The original example from release/fy24-q2 doesn't work because 'shared-volume' can't mount kubeflow-shared-pv, because the Spark Operator pods already have a volume called 'pv1' mounted to that same PVC. To get the example to work, we have to remove all references to the shared-volume volume and volume mount, and then update mainApplicationFile and 'arguments' to get the necessary data from its location on the 'pv1' mount.

Provide a clear and concise description of the content changes you're proposing. List all the changes you are making
to the content.

• Updated section ___ with ___.
• Added new subsection ___ under ___.
• Removed outdated information from ___.
• ...

Closes #...

If there is no issue related to this PR, kindly create one first to describe the motivation behind these changes.

Checklist:

• I have checked that my enhancements are not duplicates of existing content changes or additions.
• I have tested the changes in a working environment to ensure they function as intended.
• I have followed the style guide
  outlined in the contribution guidelines.

Reviewer's Tasks (for maintainers reviewing this PR):

• Verify that the tutorial functions correctly in a live environment.
• Verify that the updated content aligns with the style guide
  in the contribution guidelines.
• Check for consistency, grammar, and clarity throughout the updated content.
• Check that the related GitHub issue is up-to-date.

[mayankgarg-23]

@abe-hpe can we make similar change for spark-pi example as well otherwise it will also face similar issue.