[GitHub] aaronmarkham opened a new pull request #12945: missing line break fix for tutorials toc

[GitBox <gi...@apache.org>]

aaronmarkham opened a new pull request #12945: missing line break fix for tutorials toc
URL: https://github.com/apache/incubator-mxnet/pull/12945
 
 
   ## Description ##
   This PR fixes a Sphinx error with the tutorials index page.
   
   Sphinx requires a line break after the option block and before the table of contents list. 
   
   It was throwing this error:
   
   ```
   /home/ubuntu/incubator-mxnet/docs/tutorials/index.md:1: ERROR: Error in "toctree" directive:
   invalid option block.
   
   .. toctree::
      :hidden:
      basic/index.md
      c++/index.md
      control_flow/index.md
      embedded/index.md
      gluon/index.md
      nlp/index.md
      onnx/index.md
      python/index.md
      r/index.md
      scala/index.md
      sparse/index.md
      speech_recognition/index.md
      tensorrt/index.md
      unsupervised_learning/index.md
      vision/index.md
   ```
   

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