[Documentation] Update documentation for Selenium-accessible WebGL connection settings popup

[andreion1ca]

Documentation Update: Selenium-Accessible Connection Settings Popup for WebGL

Update the documentation to reflect the newly introduced connection settings popup for WebGL builds:

• Provide detailed instructions and screenshots (if possible) on how to access and use the settings popup to input host, port, and app name when connecting test scripts to WebGL applications.

• Explain the toggle/on-off setting for showing the popup on startup.

• Reference the implementation and requirements covered in Issue #189.

[SiminaRe]

The information was added here: https://staging-alttesterdotcom-staging.kinsta.cloud/docs/sdk/latest/pages/alttester-with-appium.html#

Some edits are need and were added to https://github.com/alttester/Unity-SDK-Closed-Source/issues/213#issue-4051449351