docs: Fix a few typos

There are small typos in:
- editor/js/defaults.js
- editor/js/defaults_mobile.js
- src/litegraph.js
- src/nodes/geometry.js
- src/nodes/gltextures.js

Fixes:
- Should read `sequentially` rather than `sequentually`.
- Should read `default` rather than `deafult`.
- Should read `visually` rather than `visualy`.
- Should read `offscreen` rather than `offscren`.
- Should read `dichotomic` rather than `dichotimic`.

Signed-off-by: Tim Gates <tim.gates@iress.com>

src/nodes/geometry.js

@@ -363,7 +363,7 @@
 			return -1;
 		if(l == 1)
 			return 0;
-		//dichotimic search
+		//dichotomic search
 		while (imax >= imin)
 		{
 			imid = ((imax + imin)*0.5)|0;

src/nodes/gltextures.js

@@ -5338,7 +5338,7 @@ void main(void){\n\
 				}
 				gl.finish2D();
 			});
-		else //rendering to offscren canvas and uploading to texture
+		else //rendering to offscreen canvas and uploading to texture
 		{
 			if(properties.clear)
 				ctx.clearRect(0,0,canvas.width,canvas.height);