Update README with links and definitions for algorithms

Author: brown9804

0_Azure/3_AzureAI/0_AISearch/demos/2_Index_Increase/README.md

@@ -63,9 +63,15 @@ Last updated: 2025-07-17
 
 
 > [!NOTE]
-> - **BM25** = the baseline keyword relevance algorithm. It scores documents based on term frequency and inverse document frequency. `BM25 is the foundation of traditional search in Azure AI Search.`
-> - **Semantic ranker** = a component that improves relevance by applying transformer-based semantic understanding on top of BM25 results. `Semantic ranker is a tool for better search, enhancing keyword matches with contextual meaning.`
-> - **Agentic retrieval** = a pipeline that integrates BM25, semantic ranker, and LLM reasoning to handle complex, multi-part queries and produce grounded answers. `Agentic retrieval is a system that uses those tools, orchestrated by LLMs, to make search conversational and intelligent.`
+> - [BM25](https://learn.microsoft.com/en-us/azure/search/index-similarity-and-scoring) = the baseline keyword relevance algorithm. It scores documents based on term frequency and inverse document frequency. `BM25 is the foundation of traditional search in Azure AI Search.`
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+<img width="740" height="278" alt="image" src="https://github.com/user-attachments/assets/457fb7d2-9d9c-478c-b1cf-20bdfe25c76e" />
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+> - [Semantic ranker](https://learn.microsoft.com/en-us/azure/search/semantic-search-overview) = a component that improves relevance by applying transformer-based semantic understanding on top of BM25 results. `Semantic ranker is a tool for better search, enhancing keyword matches with contextual meaning.`
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+<img width="710" height="399" alt="image" src="https://github.com/user-attachments/assets/7231be89-5aa0-4c63-9532-c232073a4b95" />
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+> - [Agentic retrieval](https://learn.microsoft.com/en-us/azure/search/agentic-retrieval-overview?tabs=quickstarts) = a pipeline that integrates BM25, semantic ranker, and LLM reasoning to handle complex, multi-part queries and produce grounded answers. `Agentic retrieval is a system that uses those tools, orchestrated by LLMs, to make search conversational and intelligent.`
 
 <img width="800" alt="image" src="https://github.com/user-attachments/assets/d1225f14-bc34-4f5c-b0f2-b8702bd77aca" />