docs: Apply en-GB Oxford spelling and sentence case corrections to design document

[coderabbitai]

Overview

This issue tracks additional spelling and style corrections needed for docs/lag-complexity-function-design.md to align with the repository guideline "en-GB-oxendict (-ize / -our)".

Required Corrections

1. Line 24-31: Adopt en-GB Oxford spelling

Change: prioritises → prioritizes

2. Line 84-89: Use Oxford -ize spelling

Change: optimised → optimized

3. Line 265-268: Fix trait names and use Oxford -ize

Changes:

• Fix trait names: Serialise/Deserialise → Serialize/Deserialize
• Change prose: deserialisable → deserializable

4. Line 268-277: Use Oxford -ize for nouns

Change: normalisation → normalization

5. Line 320-335: Use Oxford -ize spelling

Change: prioritising → prioritizing

6. Line 336-338: Write headings in sentence case

Change: Convert table heading to sentence case

7. Line 550-556: Sentence case and Oxford -ize for headings

Changes: Apply sentence case and normalization spelling

Context

These corrections were identified during review of PR #11: #11

Reference: #11 (comment)

Acceptance Criteria

• All 7 spelling corrections applied to docs/lag-complexity-function-design.md
• Documentation follows en-GB Oxford spelling (-ize family) consistently
• Headings use sentence case formatting
• Rust trait names use correct spelling (Serialize/Deserialize)
• Changes pass make markdownlint validation