Reduce contextual use of "NGF" three letter acronym

[ADubhlaoich]

Proposed changes

For conciseness, "ngf" is often used as part of the naming conventions for processes, image names and other artefacts. It should be avoided in documentation when referring to the actual software, which this commit addresses in a handful of identified instances.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[ADubhlaoich]

To pre-empt some possible feedback: one of the lines changes an example of a "NGF" TLA while keeping another earlier in the same paragraph. In context, the first use of "NGF" is an instance in the example, while the second instance is referring to the software in a broader sense.