docs: updated index.xml to remove some invalid double-entries
docs: updated index.xml to remove some invalid double-entries

zmaruo/CocosSharp,hig-ag/CocosSharp,mono/CocosSharp,haithemaraissia/CocosSharp,MSylvia/CocosSharp,TukekeSoft/CocosSharp,zmaruo/CocosSharp,hig-ag/CocosSharp,mono/CocosSharp,TukekeSoft/CocosSharp,MSylvia/CocosSharp,haithemaraissia/CocosSharp