You've done quite a lot of work to gather together information on GParted in one document. Kudos to you.
Following are some comments I had after reading the document:
1) Internet communication is available
In section 4.4 - Communication Interfaces, it is mentioned that GParted Live does not support any kind of network or Internet communication. Although such communication is not obvious, it is available.
You can configure a network interface IP address with either:
ifconfig and route commands and remember to edit /etc/resolve.conf.
This would permit adding extra package repositories to /etc/apt/sources.list and then updating and installing new packages with:
apt-get install some-package-name
2) Would you consider releasing your document under a free documentation license?
I did not observe a documentation license in the documentation. The GParted Manual is released under the GNU Free Documentation License v1.2 or higher. With such a license, others are permitted to alter and reproduce the documentation.
Perhaps you would consider a free documentation license, such as GNU FDL?
You can read more about about the the need for free documentation at the following link:
Why Free Software needs Free Documentation
3) Would you consider placing your document in a free documentation format?
As far as I know, both .pdf and .docx are effectively proprietary formats. At least I am not aware of free software that supports all the editing features of these formats. In order for other free documentation persons to easily update the document, the source format needs to be one that is fully editable with free software.
The GParted Manual is written in DocBook/XML, though there are other formats that would be considered a free documentation format too.