Clarify what the `Node.filename` property contains
Clarify what the `Node.filename` property contains

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