feat(occ): improve config:list help text/descriptions

[joshtrichards]

• Resolves: #

Summary

• Make language more descriptive, precise, and consistent
• Add examples

Before:

root@90c0b61e2a5c:/var/www/html# ./occ config:list --help   
Description:
  List all configs

Usage:
  config:list [options] [--] [<app>]

Arguments:
  app                    Name of the app ("system" to get the config.php values, "all" for all apps and system) [default: "all"]

Options:
      --output[=OUTPUT]  Output format (plain, json or json_pretty, default is plain) [default: "json_pretty"]
      --private          Use this option when you want to include sensitive configs like passwords, salts, ...
      --migrate          Rename config keys of all enabled apps, based on ConfigLexicon
  -h, --help             Display help for the given command. When no command is given display help for the list command
  -q, --quiet            Do not output any message
  -V, --version          Display this application version
      --ansi|--no-ansi   Force (or disable --no-ansi) ANSI output
  -n, --no-interaction   Do not ask any interactive question
      --no-warnings      Skip global warnings, show command output only
  -v|vv|vvv, --verbose   Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

Help:
  More extensive and thorough documentation may be found at https://docs.nextcloud.com

After:

root@55f7573a36fc:/var/www/html# ./occ config:list --help
Description:
  List system and app configuration values

Usage:
  config:list [options] [--] [<app>]

Arguments:
  app                    What to list: an app name, "system" for system configuration values, or "all" for system and all app configs [default: "all"]

Options:
      --output[=OUTPUT]  Output format (plain, json or json_pretty, default is plain) [default: "json_pretty"]
      --private          Include sensitive configuration values like passwords and secrets
      --migrate          Migrate config keys using the ConfigLexicon before listing
  -h, --help             Display help for the given command. When no command is given display help for the list command
  -q, --quiet            Do not output any message
  -V, --version          Display this application version
      --ansi|--no-ansi   Force (or disable --no-ansi) ANSI output
  -n, --no-interaction   Do not ask any interactive question
      --no-warnings      Skip global warnings, show command output only
  -v|vv|vvv, --verbose   Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

Help:
  The config:list command lists system and app configuration values.
  
  For system, this shows the effective system configuration as loaded by
  Nextcloud. It may include values from config.php, additional *.config.php
  files, and NC_* environment variables.
  
  Examples:
  
    php occ config:list
      List all system and app configuration values
  
    php occ config:list system
      List only system configuration values
  
    php occ config:list files_sharing
      List configuration values for the files_sharing app
  
    php occ config:list --private
      List all system and app configuration values, including sensitive values

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI