fix(docs): change filter arguments to match PascalCase

[simonsan]

Description

It fixes documentation of the command-line interface for the filter command.

Suggested changelog entry

Change documentation of filter command to match internally used PascalCase

Related issues/external references

Fixes #3877

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.
• [Required for new files] I have added any new files to the package.xml file.

[simonsan]

Ah shit, edited in a remote repository, just saw it applied formatting -_-", let me fix that.