Update documentation for vdb_upload to use realistic source data wi…

…th the `--file_source` flag (#1800)

* 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](https://github.com/nv-morpheus/Morpheus/blob/main/docs/source/developer_guide/contributing.md).
- 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.

Authors:
  - David Gardner (https://github.com/dagardner-nv)

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: #1800

examples/llm/vdb_upload/README.md

@@ -214,7 +214,7 @@ python examples/llm/main.py vdb_upload pipeline \
 ```bash
 python examples/llm/main.py vdb_upload pipeline \
   --source_type filesystem \
-  --file_source "./morpheus/data/*" \
+  --file_source="./examples/data/vdb_upload/*.jsonlines" \
   --enable_monitors \
   --embedding_model_name all-MiniLM-L6-v2
 ```
@@ -224,7 +224,7 @@ python examples/llm/main.py vdb_upload pipeline \
 ```bash
 python examples/llm/main.py vdb_upload pipeline \
   --source_type rss --source_type filesystem \
-  --file_source "./morpheus/data/*" \
+  --file_source="./examples/data/vdb_upload/*.jsonlines" \
   --interval_secs 600 \
   --enable_cache \
   --enable_monitors \