Minor Documentation Improvements: Sidebar Title and Typo Fixes

[leopardracer]

Description:

• Updated the sidebar title formatting in the minimal token transfer guide for consistency.
• Fixed a typo ("Explicitely" → "Explicitly") in the smart wallet contribution guidelines.
• Enhances clarity and maintains documentation quality.

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1