'config:export --help' includes warning about 'Undefined array key "description" HelpCLIFormatter.php:118'

[maxstarkenburg]

Describe the bug
When running drush cex --help (or similar aliases) with drush 11.1.1, the output includes [warning] Undefined array key "description" HelpCLIFormatter.php:118. I'm not able to reproduce on a different site/container using drush 10.x, nor with other commands like drush cim.

To Reproduce

• Use drush 11.1.1 (I didn't test other drush 11.x, and was unable to reproduce in drush 10.3.6 or 10.6.2).
• Run drush cex -h.

Expected behavior

• Lack of [warning]
• Lack of wondering if I did something wrong, or if something about the config state of the site is messed up, or ... :-)

Actual behavior

Export Drupal configuration to a directory.

Examples:
 drush config:export               Export configuration files to the site's config directory.                  
 drush config:export --destination Export configuration; Save files in a backup directory named config-export. 

Options:
 [warning] Undefined array key "description" HelpCLIFormatter.php:118
 --add                       Run `git add -p` after exporting. This lets you choose which config changes to sync for commit.                      
 --commit                    Run `git add -A` and `git commit` after exporting. This commits everything that was exported without prompting.      
 --message=MESSAGE           Commit comment for the exported configuration. Optional; may only be used with --commit.                             
 --destination[=DESTINATION] An arbitrary directory that should receive the exported files. A backup directory is used when no value is provided. 
 --diff                      Show preview as a diff, instead of a change list.                                                                    
 --format[=FORMAT]                                                                                                                                

Aliases: cex, config-export

Workaround
Pretend I didn't see it and cross my fingers it's harmless.

System Configuration

Q	A
Drush version?	11.1.1
Drupal version?	9.4.5
PHP version	8.0.18 (cli)
OS?	Mac 12.5.1 but run in a Docker container running Alpine Linux 3.15.4

Additional information
This seems pretty similar to #4827, but I didn't see anything obviously similar when looking in the analogous comment block in src/Drupal/Commands/config/ConfigExportCommands.php (looked pretty similar to what's in 10.x), so dunno if the fault is indeed closer to src/Commands/help/HelpCLIFormatter.php:118 or what (this is also like only my 2nd time actually peeking at drush's code).