Fixed documentation for -s option.

[joachim-n]

Description

Fixes an error in the documentation for the -s option, which says 'sniff codes' when the command actually outputs error codes.

Suggested changelog entry

Related issues/external references

Fixes #319.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
  • This change is only breaking for integrators, not for external standards or end-users.
• Documentation improvement

PR checklist

• I have checked there is no other PR open for the same change.
• I have read the Contribution Guidelines.
• I grant the project the right to include and distribute the code under the BSD-3-Clause license (and I have the right to grant these rights).
• I have added tests to cover my changes.
• I have verified that the code complies with the projects coding standards.
• [Required for new sniffs] I have added XML documentation for the sniff.

[jrfnl]

Thanks @joachim-n !

[jrfnl]

@joachim-n The changelog usually contains the full name of contributors. Which name would you like me to use for you ? If you don't want to share your name, I can just use your GitHub handle, if you prefer.

[joachim-n]

My full name's Joachim Noreiko. Thanks!