Typos fix

[romashka-btc]

Fix: Corrected typos in code comments and documentation

What was changed

1. Corrected typo unregisted to unregistered in src\interfaces\IECDSAStakeRegistryEventsAndErrors.sol (line 88).
2. Corrected typo mimicing to mimicking in docs\registries\StakeRegistry.md (line 147).
3. Corrected typo architechture to architecture in src\interfaces\IBLSSignatureChecker.sol (line 11).

Why these changes were made

• Fixing typos improves the clarity, readability, and professionalism of both the code comments and documentation.
• Accurate comments and documentation ensure better understanding for developers and maintainers.

Additional Notes

• These changes focus solely on correcting typographical errors and do not impact the functionality of the code.