Langchain intro - Example - example_selectors fix

[arindam-b]

Fix - embedded links in the notebook for example_selectors, text splitter, summarization chain and chain creation in Langchain intro.

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[polong-lin]

Hi @arindam-b , thanks for fixing these links! Before we can proceed with merging, you would need to accept and sign the CLA: https://github.com/GoogleCloudPlatform/generative-ai/pull/104/checks?check_run_id=14908796396

[arindam-b]

Hi @polong-lin, I have accepted and signed the CLA, thanks.

[arindam-b]

@polong-lin: Another modification was added, this time to the Vertex AI Matching engine index creation. That's why I have modified the PR title and added some details. Could you please review it? Thanks.