message: Fix messy rendering of docs for tf.image.extract_patches
  While working on using tf.image.extract_patches, noticed
  that the docs rendering of tf.image.extract_patches was messed.
  The issue was the missing backtick ("`") at the first line of args section.
  This PR fixes the docs rendering issue.
diff: @@ -5519,9 +5519,9 @@ def extract_image_patches_v2(images, sizes, strides, rates, padding, name=None):
  ```
  Args:
  - images: A 4-D Tensor with shape `[batch, in_rows, in_cols, depth]
  - sizes: The size of the extracted patches. Must be [1, size_rows, size_cols,
  - 1].
  + images: A 4-D Tensor with shape `[batch, in_rows, in_cols, depth]`.
  + sizes: The size of the extracted patches. Must be
  + `[1, size_rows, size_cols, 1]`.
  strides: A 1-D Tensor of length 4. How far the centers of two consecutive
  patches are in the images. Must be: `[1, stride_rows, stride_cols, 1]`.
  rates: A 1-D Tensor of length 4. Must be: `[1, rate_rows, rate_cols, 1]`.
  