Improves LineEdit documentation
Improves LineEdit documentation

* Recently supported macOS shortcuts are added
* Makes it clear than `set_text` won't trigger `text_changed`
* `minimum_spaces` is the number of space characters that can be shown
  without scrolling

Shockblast/godot,akien-mga/godot,guilhermefelipecgs/godot,MarianoGnu/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,MarianoGnu/godot,Valentactive/godot,ZuBsPaCe/godot,vkbsb/godot,Faless/godot,guilhermefelipecgs/godot,sanikoyes/godot,sanikoyes/godot,ZuBsPaCe/godot,Faless/godot,Valentactive/godot,josempans/godot,honix/godot,pkowal1982/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,DmitriySalnikov/godot,akien-mga/godot,guilhermefelipecgs/godot,Zylann/godot,godotengine/godot,ex/godot,Valentactive/godot,Valentactive/godot,josempans/godot,ZuBsPaCe/godot,Shockblast/godot,ex/godot,firefly2442/godot,firefly2442/godot,josempans/godot,vkbsb/godot,firefly2442/godot,sanikoyes/godot,godotengine/godot,Zylann/godot,Zylann/godot,ZuBsPaCe/godot,MarianoGnu/godot,vnen/godot,honix/godot,ZuBsPaCe/godot,josempans/godot,vnen/godot,akien-mga/godot,Shockblast/godot,ex/godot,firefly2442/godot,pkowal1982/godot,Shockblast/godot,BastiaanOlij/godot,MarianoGnu/godot,Shockblast/godot,DmitriySalnikov/godot,vnen/godot,MarianoGnu/godot,BastiaanOlij/godot,Shockblast/godot,sanikoyes/godot,BastiaanOlij/godot,Faless/godot,Paulloz/godot,vnen/godot,Valentactive/godot,BastiaanOlij/godot,sanikoyes/godot,honix/godot,Shockblast/godot,Zylann/godot,Zylann/godot,pkowal1982/godot,josempans/godot,firefly2442/godot,pkowal1982/godot,Paulloz/godot,firefly2442/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,josempans/godot,Faless/godot,vkbsb/godot,akien-mga/godot,pkowal1982/godot,Paulloz/godot,godotengine/godot,vkbsb/godot,Paulloz/godot,Faless/godot,DmitriySalnikov/godot,MarianoGnu/godot,firefly2442/godot,DmitriySalnikov/godot,Faless/godot,Paulloz/godot,Faless/godot,vkbsb/godot,sanikoyes/godot,pkowal1982/godot,akien-mga/godot,godotengine/godot,Zylann/godot,guilhermefelipecgs/godot,godotengine/godot,honix/godot,ex/godot,ex/godot,ex/godot,akien-mga/godot,MarianoGnu/godot,vnen/godot,ZuBsPaCe/godot,godotengine/godot,vkbsb/godot,guilhermefelipecgs/godot,godotengine/godot,vkbsb/godot,honix/godot,Valentactive/godot,Paulloz/godot,josempans/godot,vnen/godot,DmitriySalnikov/godot,josempans/godot,Zylann/godot,akien-mga/godot,pkowal1982/godot,sanikoyes/godot,honix/godot,vkbsb/godot,MarianoGnu/godot,Shockblast/godot,DmitriySalnikov/godot,Faless/godot,ex/godot,vnen/godot,akien-mga/godot,Valentactive/godot,pkowal1982/godot,Valentactive/godot,Zylann/godot,sanikoyes/godot,Paulloz/godot,ZuBsPaCe/godot,firefly2442/godot,godotengine/godot,ex/godot,vnen/godot,BastiaanOlij/godot