api: fix Noise handshake pattern (#60)

Author: MrAnno

docs/architecture/api/protocol_details.md

@@ -41,7 +41,7 @@ Size ranges:
 
 ### Overview
 
-The Noise protocol provides encrypted, authenticated communication using the [Noise XX handshake pattern](https://www.noiseprotocol.org/noise.html#interactive-handshake-patterns-fundamental).
+The Noise protocol provides encrypted, authenticated communication using the [Noise NNpsk0 handshake pattern](https://www.noiseprotocol.org/noise.html#interactive-handshake-patterns-fundamental).
 
 ### Frame Structure
 
@@ -140,7 +140,7 @@ States:
 
 3. **SERVER_HELLO**: Sending server hello with device info
 
-4. **HANDSHAKE**: Performing Noise XX handshake exchange
+4. **HANDSHAKE**: Performing Noise NNpsk0 handshake exchange
 
 5. **DATA**: Handshake complete, ready for encrypted data exchange
 
@@ -431,4 +431,4 @@ Both protocols ensure payload data starts at predictable offsets for efficient p
 
 ### Maximum Sizes
 - Message types: 0-65,535 (16-bit unsigned)
-- Frame/data sizes: up to 2^32-1 bytes (varint can encode up to 64-bit values, but practically limited by memory)
+- Frame/data sizes: up to 2^32-1 bytes (varint can encode up to 64-bit values, but practically limited by memory)