Update quickstart.mdx - Githubissues

Fixed the signer issue in the account configuration for improved functionality.
Fixed the issue of createAccount() returning undefined while not using getAccountAddress() method
?? Updated function name from createAccount() to initializeSmartAccount() for better clarity about not immediate account creation (lmk if it makes sense)
Added explanation regarding Smart Account creation, emphasizing that these accounts are actually created on-chain during their first transaction.
Corrected typos and formatting for a clearer presentation.
Enhanced code readability with inline comments.
Adjusted console logging to include EOA and SA as specified initially in the doc.
Ensured consistent terminology, using 'Smart Account' uniformly throughout the document.
Included an intermediate step in the buildUserOp function for a more detailed process description.

Please let me know if we should revert createAccount() naming since this need to be reflected in other part of the docs

bcnmy / docs