Fix typo (#54)

Summary: Pull Request resolved: https://github.com/facebookresearch/pytorch3d/pull/54

Differential Revision: D19951851

Pulled By: gkioxari

fbshipit-source-id: cf41d5806c761639d1efa42a633404b248486c30

docs/tutorials/render_textured_meshes.ipynb

@@ -300,7 +300,7 @@
    "source": [
     "## 2. Create a renderer\n",
     "\n",
-    "A renderer in PyTorch3d is composed of a **rasterizer** and a **shader** which each have a number of subcomponents such as a **camera** (orthgraphic/perspective). Here we initialize some of these components and use default values for the rest.\n",
+    "A renderer in PyTorch3d is composed of a **rasterizer** and a **shader** which each have a number of subcomponents such as a **camera** (orthographic/perspective). Here we initialize some of these components and use default values for the rest.\n",
     "\n",
     "In this example we will first create a **renderer** which uses a **perspective camera**, a **point light** and applies **phong shading**. Then we learn how to vary different components using the modular API.  "
    ]