Update component-basics.md - wrong highlight about slot Update component-basics.md In line 471, the line 4 is highlighted but that's wrong and the line 5 must be highlighted that is about slot. (#2471)

Update component-basics.md - wrong highlight about slot Update component-basics.md In line 471, the line 4 is highlighted but that's wrong and the line 5 must be highlighted that is about slot. (#2471) #1700