Expanded examples for foreach alias, loops and keywords

[PalmEmanuel]

PR Summary

Added a few examples in AboutLoopsAndPipelines regarding the foreach cmdlet alias vs loop and how the break, continue and return keywords affect pipelines vs standard loops.

Fixes #404

Context

No particular context or background for the PR, see issue for linked discussions and examples of topics.

Changes

Added a new Context to AboutLoopsAndPipelines called "Loops and Keywords" with 5 new It assertions to clarify some important things regarding pipeline loops vs keyword/standard loops.

• Loops and Keywords
  • It is possible to break a standard loop - Shows break in a normal loop
  • It is possible to skip iterations of a standard loop - Shows continue in a normal loop
  • It is possible to return a value from a standard loop - Shows return in a normal loop
  • It has the same name but not the same behaviour - Shows break with a pipeline foreach alias
  • It returns differently when used in a pipeline - Shows return with a pipeline ForEach-Object

Checklist

• [x] Pull Request has a meaningful title.
• [x] Summarised changes.
• [x] Pull Request is ready to merge & is not WIP.
• [x] Added tests / only testable interactively.
  • Make sure you add a new test if old tests do not effectively test the code changed.
• [x] Added documentation / opened issue to track adding documentation at a later date.

[PalmEmanuel]

I had trouble coming up with very clear examples for all topics in #404 without making them very bloated or advanced, let me know if there's something that doesn't feel right!

[vexx32]

Thanks for the PR! I haven't had the time to give this a thorough review yet, but I plan to shortly. 💖

Sorry for the delay in response. 🙂