Update documentation for vdb_upload to use realistic source data with the --file_source flag

[dagardner-nv]

Description

• Replace "./morpheus/data/*" as a data source for vdb_upload which is not a valid data source.
• Add new serialized dataframes to examples/data/vdb_upload
  • doca_guides.jsonlines: Serialized Dataframe from data in examples/doca/vdb_realtime/sender/dataset
  • nvidia_blogs.jsonlines: Serialized Dataframe from two Nvidia blog posts:
    • https://blogs.nvidia.com/blog/mlperf-training-benchmarks/
    • https://blogs.nvidia.com/blog/ai-security-steps/

Closes #1790

By Submitting this PR I confirm:

• I am familiar with the Contributing Guidelines.
• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

[dagardner-nv]

/merge