[8.13] [Obs AI Assistant] Fix error in reranking prompt (#179164) (#1…

…79177)

# Backport

This will backport the following commits from `main` to `8.13`:
- [[Obs AI Assistant] Fix error in reranking prompt
(#179164)](#179164)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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AI Assistant] Fix error in reranking prompt
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AI Assistant] Fix error in reranking prompt
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BACKPORT-->

Co-authored-by: Milton Hultgren <milton.hultgren@elastic.co>

x-pack/plugins/observability_ai_assistant/server/functions/context.ts

@@ -214,7 +214,7 @@ async function scoreSuggestions({
 
   const newUserMessageContent =
     dedent(`Given the following question, score the documents that are relevant to the question. on a scale from 0 to 7,
-    0 being completely relevant, and 7 being extremely relevant. Information is relevant to the question if it helps in
+    0 being completely irrelevant, and 7 being extremely relevant. Information is relevant to the question if it helps in
     answering the question. Judge it according to the following criteria:
 
     - The document is relevant to the question, and the rest of the conversation