Fix typo(?) in architecture-overview.md (#74)

docs: Update number of possible test results from 3 to 4 in documentation

Co-authored-by: Maximilian Laue <[email protected]>

docs/architecture-overview.md

@@ -34,7 +34,7 @@ Figure 1: Components Test Result Server
 |Entity|	Definition|	
 | ------------- |:-------------:|
 |GUID|	Identifier for a SARS-CoV-2 Test. This component will deal only with hashed instances of the GUID. For the details of the hashing see used cryptographic algorithms. The GUID has a length of 152 bits, it consists of a prefix of 24 bits and a main part of 128 bits. Only the main part is generated by a cryptographically reliable process.	|
-|test result|	The actual result of the test represented by a number between 1 and 3. 1=negative, 2=positive, 3=test invalid, 4=test redeemed 	|
+|test result|	The actual result of the test represented by a number between 1 and 4. 1=negative, 2=positive, 3=test invalid, 4=test redeemed 	|
 
 
 # Software Design