Review technical content: Concordium Wallet for Web FAQ

Technical review of the Wallet for Web FAQ documentation to verify technical accuracy and completeness.

Review focus:

* Correctness of all technical information
* Completeness of information
* Removal of irrelevant or redundant information

Review is complete when:

* All technical information has been verified
* Missing information has been identified and added
* Irrelevant or redundant information has been deleted
* PR with necessary changes has been submitted

Page to review:

[Concordium Wallet for Web FAQ](https://docs.concordium.com/en/mainnet/docs/browser-wallet/browser-wallet-faq.html): [https://github.com/Concordium/concordium.github.io/blob/main/source/mainnet/docs/browser-wallet/browser-wallet-faq.rst](https://github.com/Concordium/concordium.github.io/blob/main/source/mainnet/docs/browser-wallet/browser-wallet-faq.rst)

Note: A separate review of language and style will be conducted after the technical review is complete.