Description

I added a secondary example to this existing notebook on how to build a LangChain LCEL runnable chain with message history using the AzureML models.

Checklist

[ x] I have read the contribution guidelines.
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[ n/a] I have coordinated with the docs team (mldocs@microsoft.com) if this PR deletes files or changes any file names or file extensions.
[ n/a] Pull request includes test coverage for the included changes.
[ n/a] This notebook or file is added to the CODEOWNERS file, pointing to the author or the author's team.