docs: Remove some newlines

[roottool]

Description

Boundary Checklist (Required)

safe-formdata enforces a strict trust boundary for FormData.
If any item below does not apply, this change likely does not belong here.

• No interpretation

  • Key names are treated as opaque strings
  • No structural inference ([], ., brackets, paths, etc.)

• No silent behavior

  • No merging, overwriting, auto-fixing, or implicit resolution
  • All boundary violations are reported explicitly

• Boundary respected

  • No validation, coercion, schema, framework conventions, or business logic

📘 Boundary rules & non-goals:
https://github.com/roottool/safe-formdata/blob/main/AGENTS.md

Type of Change

• Bug fix
• Security fix
• Documentation
• Refactoring (no behavior change)
• Tests
• Tooling / CI

Testing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (cb57722) to head (447b6d0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #39   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           22        22           
  Branches         6         6           
=========================================
  Hits            22        22           

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