Fix typos and formatting issues in documentation

[King31T]

Summary

• Fix Chinese typos: wrong characters, missing characters, repeated words
• Fix English spelling errors (e.g. gesleft→gasleft, verifing→verifying)
• Fix punctuation issues (duplicate punctuation, mixed Chinese/English punctuation)
• Add spaces between Chinese and English/numbers for better readability
• Normalize terminology inconsistencies across docs

Scope

15 files referenced in mkdocs.yml nav

Test plan

• Verify mkdocs build succeeds
• Spot check affected pages render correctly