Fix typos across multiple documentation files

[gasaicrypto]

Fix typos in documentation files

Description

What changed? Why?

• Fixed various typos across multiple documentation files to improve clarity and professionalism
• Corrected spelling errors in user-facing documentation

Notes to reviewers

• All changes are minor typo fixes, no functional changes were made
• Changes were made across 4 different documentation files:
  1. basename-transfer.mdx
  2. coin-a-joke-app.mdx
  3. accept-payments.mdx
  4. debugging.mdx

How has it been tested?

• Changes were reviewed locally in markdown preview
• All modified files were checked for proper rendering

Changes Summary

• Fixed typo in basename-transfer.mdx ("new a wallet" → "new wallet")
• Fixed typo in coin-a-joke-app.mdx ("referal" → "referral")
• Fixed typo in accept-payments.mdx ("fulfil" → "fulfill")
• Fixed typo in debugging.mdx ("enviornment" → "environment")

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	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