Docs: Fix link to example in TGALoader page.

docs/examples/en/loaders/TGALoader.html

@@ -52,7 +52,7 @@
 		} );
 		</code>
 
-		[example:webgl_materials_texture_tga]
+		[example:webgl_loader_texture_tga]
 
 		<h2>Constructor</h2>
 

docs/examples/zh/loaders/TGALoader.html

@@ -52,7 +52,7 @@
 		} );
 		</code>
 
-		[example:webgl_materials_texture_tga]
+		[example:webgl_loader_texture_tga]
 
 		<h2>Constructor</h2>