doc: Fix Image 'set_pixel' doc for use of 'create'

Fixes #72904.

doc/classes/HTTPRequest.xml

@@ -141,8 +141,7 @@
 		        GD.PushError("Couldn't load the image.");
 		    }
 
-		    var texture = new ImageTexture();
-		    texture.CreateFromImage(image);
+		    var texture = ImageTexture.CreateFromImage(image);
 
 		    // Display the image in a TextureRect node.
 		    var textureRect = new TextureRect();

doc/classes/Image.xml

@@ -482,16 +482,14 @@
 				[gdscript]
 				var img_width = 10
 				var img_height = 5
-				var img = Image.new()
-				img.create(img_width, img_height, false, Image.FORMAT_RGBA8)
+				var img = Image.create(img_width, img_height, false, Image.FORMAT_RGBA8)
 
 				img.set_pixel(1, 2, Color.RED) # Sets the color at (1, 2) to red.
 				[/gdscript]
 				[csharp]
 				int imgWidth = 10;
 				int imgHeight = 5;
-				var img = new Image();
-				img.Create(imgWidth, imgHeight, false, Image.Format.Rgba8);
+				var img = Image.Create(imgWidth, imgHeight, false, Image.Format.Rgba8);
 
 				img.SetPixel(1, 2, Colors.Red); // Sets the color at (1, 2) to red.
 				[/csharp]
@@ -510,16 +508,14 @@
 				[gdscript]
 				var img_width = 10
 				var img_height = 5
-				var img = Image.new()
-				img.create(img_width, img_height, false, Image.FORMAT_RGBA8)
+				var img = Image.create(img_width, img_height, false, Image.FORMAT_RGBA8)
 
 				img.set_pixelv(Vector2i(1, 2), Color.RED) # Sets the color at (1, 2) to red.
 				[/gdscript]
 				[csharp]
 				int imgWidth = 10;
 				int imgHeight = 5;
-				var img = new Image();
-				img.Create(imgWidth, imgHeight, false, Image.Format.Rgba8);
+				var img = Image.Create(imgWidth, imgHeight, false, Image.Format.Rgba8);
 
 				img.SetPixelv(new Vector2I(1, 2), Colors.Red); // Sets the color at (1, 2) to red.
 				[/csharp]