Fixed URL typo (#113)

Author: vfdev-5

docs/digits_diffusion_model.ipynb

@@ -219,7 +219,7 @@
    "source": [
     "## Building your diffusion model\n",
     "\n",
-    "Now you will start developing the parts of your [diffusion model](https://en.wikipedia.org/wiki/Diffusion_model). It is composed of a (UNet architecture)[https://en.wikipedia.org/wiki/U-Net] backbone and the diffusion layers.\n",
+    "Now you will start developing the parts of your [diffusion model](https://en.wikipedia.org/wiki/Diffusion_model). It is composed of a [UNet architecture](https://en.wikipedia.org/wiki/U-Net) backbone and the diffusion layers.\n",
     "\n",
     "### U-Net Architecture\n",
     "\n",

docs/digits_diffusion_model.md

@@ -116,7 +116,7 @@ plt.show()
 
 ## Building your diffusion model
 
-Now you will start developing the parts of your [diffusion model](https://en.wikipedia.org/wiki/Diffusion_model). It is composed of a (UNet architecture)[https://en.wikipedia.org/wiki/U-Net] backbone and the diffusion layers.
+Now you will start developing the parts of your [diffusion model](https://en.wikipedia.org/wiki/Diffusion_model). It is composed of a [UNet architecture](https://en.wikipedia.org/wiki/U-Net) backbone and the diffusion layers.
 
 ### U-Net Architecture