Documentation updates for Drupal 11 wxt

Problem/Motivation

https://drupalwxt.github.io/docs/general/installation/

Currently says:
# Requires PHP 8.3 (Drupal 11 - alpha release)
should be changed to
# Requires PHP 8.3 (Drupal 11 LTS)

Steps to reproduce

Visit the documentation page

Proposed resolution

See issue summary for suggested change

Remaining tasks

Make the changes

User interface changes

Documentation