Reference the Git .gitattributes documentation. (#4525)
Reference the Git .gitattributes documentation. (#4525)

Fixes #4524.
pchaigno/linguist,sebgod/linguist,github/linguist,erkyrath/linguist,github/linguist,sebgod/linguist,sebgod/linguist,github/linguist,christop/linguist,erkyrath/linguist,pchaigno/linguist,pchaigno/linguist,pchaigno/linguist,christop/linguist,github/linguist,sebgod/linguist,erkyrath/linguist,erkyrath/linguist