docs: Caveats of NavigationMesh.create_from_mesh
docs: Caveats of NavigationMesh.create_from_mesh

Adds a note explaining the requirements of the given [Mesh] when converting a [Mesh] to a [NavigationMesh] using `NavigationMesh.create_from_mesh`.
pkowal1982/godot,Zylann/godot,Shockblast/godot,pkowal1982/godot,Valentactive/godot,pkowal1982/godot,Shockblast/godot,sanikoyes/godot,sanikoyes/godot,vkbsb/godot,josempans/godot,firefly2442/godot,pkowal1982/godot,pkowal1982/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,josempans/godot,godotengine/godot,pkowal1982/godot,Shockblast/godot,akien-mga/godot,firefly2442/godot,firefly2442/godot,vkbsb/godot,akien-mga/godot,Zylann/godot,BastiaanOlij/godot,godotengine/godot,sanikoyes/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,godotengine/godot,guilhermefelipecgs/godot,josempans/godot,Shockblast/godot,firefly2442/godot,sanikoyes/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,BastiaanOlij/godot,ZuBsPaCe/godot,godotengine/godot,josempans/godot,akien-mga/godot,Valentactive/godot,akien-mga/godot,vkbsb/godot,godotengine/godot,vkbsb/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,Zylann/godot,Valentactive/godot,sanikoyes/godot,Zylann/godot,guilhermefelipecgs/godot,Zylann/godot,Valentactive/godot,Valentactive/godot,josempans/godot,Zylann/godot,josempans/godot,sanikoyes/godot,ZuBsPaCe/godot,BastiaanOlij/godot,Valentactive/godot,firefly2442/godot,ZuBsPaCe/godot,sanikoyes/godot,godotengine/godot,godotengine/godot,akien-mga/godot,josempans/godot,vkbsb/godot,firefly2442/godot,akien-mga/godot,firefly2442/godot,akien-mga/godot,josempans/godot,akien-mga/godot,vkbsb/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,Shockblast/godot,Valentactive/godot,Shockblast/godot,Shockblast/godot,sanikoyes/godot,guilhermefelipecgs/godot,vkbsb/godot,pkowal1982/godot,vkbsb/godot,Zylann/godot,pkowal1982/godot,BastiaanOlij/godot,firefly2442/godot,ZuBsPaCe/godot,godotengine/godot,Valentactive/godot,ZuBsPaCe/godot,Shockblast/godot,BastiaanOlij/godot,Zylann/godot