[PR] doc: fix the MTTR description [incubator-devlake-website]

[via GitHub]

Startrekzky opened a new pull request, #771:
URL: https://github.com/apache/incubator-devlake-website/pull/771

   ### ⚠️   Pre Checklist
   
   > Please complete _ALL_ items in this checklist, and remove before submitting
   
   - [x] I have `npm run build` and `npm run serve` locally before submitting 
this PR
   - [x] I have read through the 
[Contributing](https://devlake.apache.org/community/) Documentation
   
   # Summary
   Fix the description of MTTR from `mean` to `median`.
   
   ### Screenshots
   
![image](https://github.com/user-attachments/assets/500a59ef-e458-41db-8113-320dc104038d)
   


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