chore(learn): modernize instructor-multitask.ipynb to SDK v8

[jhamon]

Summary

• Update pinecone-client to pinecone==8.0.0
• Pin all dependency versions (InstructorEmbedding, sentence-transformers, torch, scikit-learn, numpy)
• Fix grammar: "a efficient" → "an efficient"
• Improve clarity and readability

Test plan

• Verify notebook runs end-to-end without errors
• Check that all imports work with pinned versions
• Validate SDK v8 patterns are followed
• Review writing style matches .ai/writing-guidelines.md

Related

Closes https://linear.app/pinecone-io/issue/SDK-164

🤖 Generated with Claude Code

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Note

Low Risk
Only changes an educational notebook; main risk is runtime incompatibilities from pinned package versions and the SDK v8 API migration.

Overview
Modernizes learn/search/multitask/instructor-multitask.ipynb to use Pinecone SDK v8 (switching to pinecone==8.0.0 and from pinecone import Pinecone/ServerlessSpec usage) while keeping the same semantic-search and QA walkthrough flow.

The notebook now pins all key Python dependencies in the install cell and cleans up/reshapes notebook content (clearing large captured outputs, minor wording/grammar tweaks) to improve reproducibility and readability.

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