doc: Missing description of net_if in documentation of samples/net/wifi/apsta_module

[xelathan]

Describe the bug

In the README.md, there is a sentence that cuts off at "The net_if." More information on net_if should be provided or it should be completely left out.

Regression

• This is a regression.

Steps to reproduce

No response

Relevant log output

Impact

Annoyance – Minor irritation; no significant impact on usability or functionality.

Environment

No response

Additional Context

No response

[github-actions]

Hi @xelathan! We appreciate you submitting your first issue for our open-source project. 🌟

Even though I'm a bot, I can assure you that the whole community is genuinely grateful for your time and effort. 🤖💙