Rollup merge of #143903 - vtjl10:master, r=jieyouxu

Fix typos in documentation files

## Summary
Fix minor typos in documentation files to improve readability.

## Changes
- **tests/mir-opt/pre-codegen/README.md**: Fix typo `condiguration` → `configuration`
- **tests/ui/SUMMARY.md**: Fix typo in RFC link URL (`namepsace ` → `namespace`)

## Type of Change
- [x] Documentation update
- [x] Bug fix (typo correction)

Author: samueltardieu