Fixes broken link in edsr.py (#1164)

* Updated Fix broken link of tf.data.Dataset in edsr

It is patch clone of PR #1101 which updates a broken link at  
'tf.Data.Dataset'
which replaces 'tf.Data.Dataset' with 'tf.data.Dataset'

* Copied the changes to md and iynb

Copied the changes to md and iynb

* Copied the changes to md and iynb

Copied the changes to md and iynb

Author: mohantym

examples/vision/edsr.py

@@ -135,7 +135,7 @@ def random_crop(lowres_img, highres_img, hr_crop_size=96, scale=4):
 
 
 """
-## Prepare a `tf.Data.Dataset` object
+## Prepare a `tf.data.Dataset` object
 
 We augment the training data with random horizontal flips and 90 rotations.
 

examples/vision/ipynb/edsr.ipynb

@@ -194,7 +194,7 @@
     "colab_type": "text"
    },
    "source": [
-    "## Prepare a `tf.Data.Dataset` object\n",
+    "## Prepare a `tf.data.Dataset` object\n",
     "\n",
     "We augment the training data with random horizontal flips and 90 rotations.\n",
     "\n",

examples/vision/md/edsr.md

@@ -143,7 +143,7 @@ def random_crop(lowres_img, highres_img, hr_crop_size=96, scale=4):
 ```
 
 ---
-## Prepare a `tf.Data.Dataset` object
+## Prepare a `tf.data.Dataset` object
 
 We augment the training data with random horizontal flips and 90 rotations.