azurerm_linux_web_app - update docs to fix deprecated az cli command

[bubbletroubles]

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Description

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change
• Documentation

Details

The command az webapp list-runtimes --linux is now deprecated. When running it, a message appears Argument 'linux' has been deprecated and will be removed in a future release. Use '--os-type' instead.

Updated the docs to use the new command az webapp list-runtimes --os-type linux which provides output such as

az webapp list-runtimes --os-type linux
[
  "DOTNETCORE:9.0",
  "DOTNETCORE:8.0",
  "DOTNETCORE:7.0",
  "DOTNETCORE:6.0",
  "NODE:20-lts",
  "NODE:18-lts",
  "NODE:16-lts",
  "PYTHON:3.12",
  "PYTHON:3.11",
  "PYTHON:3.10",
  "PYTHON:3.9",
  "PYTHON:3.8",
  "PHP:8.3",
  "PHP:8.2",
  "PHP:8.1",
  "PHP:8.0",
  "JAVA:21-java21",
  "JAVA:17-java17",
  "JAVA:11-java11",
  "JAVA:8-jre8",
  "JBOSSEAP:8-java17",
  "JBOSSEAP:8-java11",
  "JBOSSEAP:8-java17_byol",
  "JBOSSEAP:8-java11_byol",
  "JBOSSEAP:7-java17",
  "JBOSSEAP:7-java11",
  "JBOSSEAP:7-java8",
  "JBOSSEAP:7-java17_byol",
  "JBOSSEAP:7-java11_byol",
  "JBOSSEAP:7-java8_byol",
  "TOMCAT:10.1-java21",
  "TOMCAT:10.1-java17",
  "TOMCAT:10.1-java11",
  "TOMCAT:10.0-java17",
  "TOMCAT:10.0-java11",
  "TOMCAT:10.0-jre8",
  "TOMCAT:9.0-java21",
  "TOMCAT:9.0-java17",
  "TOMCAT:9.0-java11",
  "TOMCAT:9.0-jre8",
  "TOMCAT:8.5-java11",
  "TOMCAT:8.5-jre8"
]

Related Issue(s)

Fixes #0000

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[catriona-m]

Thanks @bubbletroubles LGTM!