Cannot make getting started manual instrumentation example to work

[tigrannajaryan]

Describe your environment

$ php -v
PHP 8.2.7 (cli) (built: Jun  8 2023 20:05:45) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.2.7, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.7, Copyright (c), by Zend Technologies

Steps to reproduce
Follow instruction at https://opentelemetry.io/docs/instrumentation/php/manual/
Copy example from https://opentelemetry.io/docs/instrumentation/php/manual/#example to GetttingStarted.php
Run https://opentelemetry.io/docs/instrumentation/php/manual/#example
Open http://localhost:8080/rolldice

What is the expected behavior?
Page to load without errors

What is the actual behavior?
The following error is shown:

Fatal error: Uncaught Error: Class "ResourceInfoFactory" not found in /Users/tnajaryan/work/experiments/otel-php/GettingStarted.php:2 Stack trace: #0 {main} thrown in /Users/tnajaryan/work/experiments/otel-php/GettingStarted.php on line 2

Additional context
Testing for open-telemetry/community#1537
I started with trace example, the next step would be adding logs, but I didn't get there.

[tigrannajaryan]

Sorry for dumb bug reports. For now I am following the Getting Started instructions to the letter without trying to troubleshoot myself, just to make sure our instructions are good.

[brettmc]

This is because we haven't put all of the import statements in for brevity. To make the example work via copy/paste, we will need to add this (plus the <?php opening tag)

[brettmc]

The docs have been thoroughly updated, and in my testing all of the examples are now runnable.