Fix typos

[Marcofann]

This pull request corrects grammatical errors in comments across two smart contracts: RevolutAccountRegistry.sol and WiseAccountRegistry.sol.
The changes replace incorrect usage of "an" with "a" when referring to words that do not begin with a vowel sound, improving the readability and accuracy of the documentation.

Files Updated

1. RevolutAccountRegistry.sol

   • Corrected: "an passed accountId's" → "a passed accountId's"
   • Corrected: "an Revolut account" → "a Revolut account"

2. WiseAccountRegistry.sol

   • Corrected: "an passed accountId's" → "a passed accountId's"
   • Corrected: "an Wise account" → "a Wise account"