Fix markdown syntax issues and minor typos in OWASP Top 10 (2025)

[prasunsrivastav123-lang]

Summary

This pull request fixes several minor documentation issues in the OWASP Top 10
(2025) draft to improve readability and correctness.

Changes Made

• Fixed a missing closing bracket in the “By Application exposure (by environment)” section
• Removed an unnecessary extra space in the DSOM (DevSecOps Maturity Model) reference
• Corrected a markdown syntax error in the OWASP ASVS reference
• Fixed a typo in the “User threat modeling as an educational” sentence

Files Affected

• 2025/docs/en/0x02_2025-What_are_Application_Security_Risks.md
• 2025/docs/en/0x03_2025-Establishing_a_Modern_Application_Security_Program.md
• 2025/docs/en/A06_2025-Insecure_Design.md

Scope

• Documentation-only changes
• No changes to technical meaning or OWASP risk definitions

Checklist

• Markdown syntax validated
• Changes are minimal and focused
• No functional or semantic changes

Thank you for reviewing this contribution.