Erroneous examples and other issues in 06-networks.md

[Conrad Bhuiyan-Volkoff]

What is the problem you're trying to solve

The Networks Top-Level Element documentation has specific issues including erroneous examples where volumes is used instead of networks, an incomplete ipam example, and the absence of an internal example.

Describe the solution you'd like

To improve the documentation, the following changes are suggested:

1. There are instances where the documentation refers to volumes instead of networks. These instances should be identified and corrected to ensure examples align with the context.

2. The ipam example lacks some key details which can create confusion for users. The example should be revised to be more comprehensive and to better demonstrate how to use ipam in practice.

3. The documentation currently lacks an example of how to create isolated networks with internal. This is a common use case and should be added to the documentation to help guide users through its implementation.

Additional context

Addressing these specific issues will greatly enhance the utility and clarity of the documentation, contributing to an overall better user experience.

[Conrad Bhuiyan-Volkoff]

Resolved by #388