Existing Sample Changes

Description

Update learning path readme to notify users of 2-tile environment variable need

Fixes Issue#

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No change

Please delete options that are not relevant. Add a 'X' to the one that is applicable.

Jimmy tested, reviewed README.md in webbrowser

[x] Command Line
[ ] oneapi-cli
[ ] Visual Studio
[ ] Eclipse IDE
[ ] VSCode
[ ] When compiling the compliler flag "-Wall -Wformat-security -Werror=format-security" was used

Delete this line and everything below if this is not a PR for a new code sample

Delete this line and all above it if this PR is for a new code sample

Please include a description of the sample

Administrative

[ ] Review sample design with the appropriate Domain Expert:
[ ] If you have any new dependencies/binaries, inform the oneAPI Code Samples Project Manager

Code Development

[ ] Implement coding guidelines and ensure code quality. see wiki for details
[ ] Adhere to readme template
[ ] Enforce format via clang-format config file
[ ] Adhere to sample.json specification. https://github.com/oneapi-src/oneAPI-samples/wiki/sample-json-specification
[ ] Ensure/create CI test configurations for sample (ciTests field) https://github.com/oneapi-src/oneAPI-samples/wiki/sample-json-ci-test-object
[ ] Run jsonlint on sample.json to verify json syntax. www.jsonlint.com

Security and Legal

[ ] OSPDT Approval (see Project Manager for assistance)
[ ] Compile using the following compiler flags and fix any warnings, the falgs are: "/Wall -Wformat-security -Werror=format-security"
[ ] Bandit Scans (Python only)
[ ] Virus scan

Review