Fix expansion of LLM

[markphip]

LLM stands for Large Language Model not Language Learning Model

Why:

Closes: #36401

What's being changed (if available, include any code snippets, screenshots, or gifs):

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Source	Review	Production	What Changed
copilot/building-copilot-extensions/building-a-copilot-agent-for-your-copilot-extension/using-copilots-llm-for-your-agent.md	fpt ghec	fpt ghec

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[Copilot]

PR Overview

This PR updates the expansion of "LLM" from "Language Learning Model" to "Large Language Model" to accurately reflect its meaning.

• Updated header to reflect the correct expansion
• Revised content text for consistency

Reviewed Changes

File	Description
content/copilot/building-copilot-extensions/building-a-copilot-agent-for-your-copilot-extension/using-copilots-llm-for-your-agent.md	Updated LLM expansion in header and body copy

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

content/copilot/building-copilot-extensions/building-a-copilot-agent-for-your-copilot-extension/using-copilots-llm-for-your-agent.md:13

• The header now correctly refers to 'Large Language Model'. Please confirm that all previous references to the incorrect expansion have been updated consistently throughout the document.

## About {% data variables.product.prodname_copilot_short %}'s Large Language Model (LLM)

content/copilot/building-copilot-extensions/building-a-copilot-agent-for-your-copilot-extension/using-copilots-llm-for-your-agent.md:15

• The body copy properly reflects the correct expansion for LLM. Please double-check that this update aligns with other documents referencing LLM.

{% data variables.product.prodname_copilot_short %}'s Large Language Model (LLM) is a powerful, large-scale language model that is trained on a diverse range of data sources, including code, documentation, and other text. {% data variables.product.prodname_copilot_short %}'s LLM underpins the functionality for {% data variables.product.prodname_copilot %}, and is used to power all of {% data variables.product.prodname_copilot_short %}'s features, including code generation, documentation generation, and code completion.

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[nguyenalex836]

@markphip Thanks so much for opening a PR with this fix! I'll update the branch and get this merged once tests are passing 🍏

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