DIP-X: Correct Typos in Multiple DIP Files

[cypherpepe]

Description

This pull request corrects typos and minor grammatical errors in multiple DIP markdown files to improve readability and professionalism. The affected files are:

• DIP-0.md
• DIP-1.md
• DIP-16.md
• DIP-18.md
• DIP-21.md
• DIP-28.md
• DIP-38.md
• DIP-46.md
• DIP-58.md
• DIP-59.md
• DIP-60.md

Related DIP issue

N/A

Checklist

• [x] Correct markdown (e.g. headers with ##, header surrounded by ---)
• [x] syntax check
• [x] filename is DIP-X.md (with X being the correct DIP number)
• [x] header contains (in this order)
  • [x] DIP
  • [x] Title
  • [x] Status
  • [x] Themes
  • [x] Tags
  • [x] Authors
  • [x] Resources Required (optional)
  • [x] Discussion (with link to devcon forum)
  • [x] Created (in the format year-month-day e.g 2020-4-20)
• [x] contains these sections:
  • [x] Abstract
  • [x] Rationale
  • [x] Implementation
  • [x] Operational Requirements & Ownership
• [x] PR title prefixed with DIP-X