Fix Typos and Update Links in Documentation

[Pricstas]

This PR addresses several minor typographical errors and outdated links in the documentation files to improve readability, accuracy, and user experience.
The following changes have been made:

1. Typographical Fixes:

   • 1_verify-contract-with-basescan.md:
     • Corrected usage of "a" to "an" in references to "RPC URL".
   • 4_hardhat-test-coverage.md:
     • Fixed grammatical errors in test descriptions, updating "a owner" to "an owner".
   • 1_smart-wallet-spend-permissions.md:
     • Corrected "an wallet" to "a wallet" for proper grammatical usage.

2. Link Updates:

   • decomissioning-public-geth-archive-snapshots.md:
     • Updated GitHub URL to point to the correct Base node repository.
   • oracles.md:
     • Updated Supra documentation link to the latest valid URL.

Notes to Reviewers:

• This PR focuses solely on text fixes and does not introduce functional or structural changes to the codebase.
• Please verify the updated links for accuracy and functionality.

How Has It Been Tested?:

• Reviewed the changes for correctness in a local markdown preview.
• Verified updated links to ensure they are active and direct to the intended resources.

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Name	Status	Preview	Comments	Updated (UTC)
web-base-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 24, 2024 4:21pm

[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 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

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