updated missed fontawesome changes in index3.html
updated missed fontawesome changes in index3.html

- replaced `fas fa-circle-o` with `far fa-circle`
oyjt/AdminLTE,oyjt/AdminLTE,garrettwong/AdminLTE,almasaeed2010/AdminLTE,slachiewicz/AdminLTE,almasaeed2010/AdminLTE,slachiewicz/AdminLTE,oyjt/AdminLTE,garrettwong/AdminLTE