N1 Console. Config templates. Open issues with doc

[mjang]

Describe the bug

Based on discussions in the internal repo

Describe the bug

Address the following unresolved issues from https://github.com/nginx/internal-docs/pull/243

• author-templates.md:
  • "do you think it's helpful to show how nested variables can be used in a template file?"
  • "Always pass the doc"
  • Good v. Bad examples
  • Also
  • Definite bug
  • Update e.g. to for example
  • also
• import-templates.md:
  • not sure if it's important to make this distinction - was this .conf extension added by NGINX or by NGINX One Console?

Additional context

Content released through OSS repo -- PR 1233

Sensitive Information

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[mjang]

cc @sylwang , since you've brought up most of these issues