Correct AASd-002

see #295 
for backward compatibility reasons idShort can end with an underscore. Additionally also 1 char idShorts are allowed.

documentation/IDTA-01001/modules/Constraints/constraints.adoc

@@ -8,7 +8,7 @@ SPDX-License-Identifier: CC-BY-4.0
 ////
 
 // Constraints
-:aasd002: pass:q[[underline]#Constraint AASd-002:# _idShort_ of __Referable__s shall only feature letters, digits, hyphen ("-") and  underscore ("_"); starting mandatory with a letter, and not ending with a hypen or underscore, i.e. ^[a-zA-Z][a-zA-Z0-9_-]*[a-zA-Z0-9_]+$.]
+:aasd002: pass:q[[underline]#Constraint AASd-002:# _idShort_ of __Referable__s shall only feature letters, digits, hyphen ("-") and  underscore ("_"); starting mandatory with a letter, and not ending with a hypen, i.e. ^[a-zA-Z] ([a-zA-Z0-9_-][a-zA-Z0-9_]+ | [a-zA-Z0-9_] ) $.]
 :aasd005: pass:q[[underline]#Constraint AASd-005:# If _AdministrativeInformation_/version is not specified, _AdministrativeInformation/revision_ shall also be unspecified. This means that a revision requires a version. If there is no version, there is no revision. Revision is optional.]
 :aasd006: pass:q[[underline]#Constraint AASd-006:# If both, the _value_ and the _valueId_ of a _Qualifier_ are present, the value needs to be identical to the value of the referenced coded value in _Qualifier/valueId_.]
 :aasd007: pass:q[[underline]#Constraint AASd-007:# If both the _Property/value_ and the _Property/valueId_ are present, the value of _Property/value_ needs to be identical to the value of the referenced coded value in _Property/valueId_.]