Question about a Yobot edit 

Regarding this Yobot edit, with edit summary "WP:CHECKWIKI error fixes using AWB (10479)"
Where do I look up the code "10479" to see what it means?
Which Wikipedia:WikiProject Check Wikipedia/List of errors code number applies for this edit?
What does the edit fix? It seems counter to this edit, which was to "Update for Unicode 7.0"
Thanks,