minor #47381 [FrameworkBundle] fix bad help message in cache warmup command (Houssem)

This PR was merged into the 4.4 branch.

Discussion
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[FrameworkBundle] fix bad help message in cache warmup command

| Q             | A
| ------------- | ---
| Branch?       |  4.4 for bug fixes <!-- see below -->
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #47380 <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->
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This feature was removed years ago due to providing no benefit on PHP 7+

Commits
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72afc77ed6 fix bad help message in cache warmup command

Author: fabpot

Command/CacheWarmupCommand.php

@@ -53,11 +53,6 @@ protected function configure()
 
 Before running this command, the cache must be empty.
 
-This command does not generate the classes cache (as when executing this
-command, too many classes that should be part of the cache are already loaded
-in memory). Use <comment>curl</comment> or any other similar tool to warm up
-the classes cache if you want.
-
 EOF
             )
         ;