Update examples.md to include Powershell for each example

[aaronjohnson]

This pull request updates the docs/api/central/examples.md file to provide PowerShell alternatives for various API operations, alongside the existing shell curl examples. The changes also include a note about potential issues when using curl in PowerShell.

Documentation Enhancements:

• Added a note about potential errors when using curl within PowerShell, explaining the differences and suggesting alternatives like Invoke-WebRequest or curl.exe. (docs/api/central/examples.md)

PowerShell Examples:

• Added PowerShell example for listing current networks using Invoke-WebRequest. (docs/api/central/examples.md)
• Added PowerShell example for listing network members using Invoke-WebRequest. (docs/api/central/examples.md)
• Added PowerShell example for authorizing a network member using Invoke-WebRequest. (docs/api/central/examples.md)
• Added PowerShell example for deauthorizing a network member using Invoke-WebRequest. (docs/api/central/examples.md)

[aaronjohnson]

A repeatable error I need help with decipering,

https://github.com/zerotier/docs/actions/runs/11488030334

[glimberg]

There needs to be a blank line before and after each

```
...code
```

block

[aaronjohnson]

There needs to be a blank line before and after each

...code

block

Right on. Thank you

[laduke]

see readme to iterate locally

[aaronjohnson]

Follow on from related PR #212