Docs: fix typo for Missing RequiredFileNotice

[isabelle-dr]

Summary:
The table in NOTICES.md was showing more values than what the notice produced.

Expected behaviour:
Only the file name is produced by this notice, as seen in the MissingRequiredFileNotice.java file:

public class MissingRequiredFileNotice extends ValidationNotice {
  private final String filename;

  public MissingRequiredFileNotice(String filename) {
    super(SeverityLevel.ERROR);
    this.filename = filename;
  }
}

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[maximearmstrong]

LGTM! Thank you @isabelle-dr