[Bug]: Fix inconsistencies on textual notation

[antoineatstariongroup]

What type of issue is this?

• Bug report

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of the SysML2.NET
• I have searched open and closed issues to ensure it has not already been reported

Description

The textual notation produced have some inconsistencies based on the expected output.
Fix should cover:

• When no upper value on multiplicity, the output still contains '..'
• Some attributes/docs are missing

Steps to Reproduce

System Configuration

• SysML2.NET version:
• Environment (Operating system, version and so on):
• .NET Framework version:
• Additional information: