Lint more md files

.github/ISSUE_TEMPLATE/bug_report.md

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 ---
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 name: Is this a bug in Notebook? Open an issue.
 about: If you're not sure, feel free to post your question on Jupyter's Discourse channel.
 title: ''
@@ -20,7 +21,7 @@ If you're having issues installing Jupyter Notebook, or you're having another is
 1. scan the "What to do when things go wrong" (https://jupyter-notebook.readthedocs.io/en/stable/troubleshooting.html#what-to-do-when-things-go-wrong) page in our documentation to see if your question has already been answered
 
 2. post your question on the Jupyter Notebook discourse channel (https://discourse.jupyter.org/c/notebook/31). There are many more people in the Jupyter community that engage on that channel.
--->
+   -->
 
 **Describe the bug**
 A clear and concise description of what the bug is.

docs-translations/ja-JP/README.md

@@ -3,7 +3,7 @@
 [![Google Group](https://img.shields.io/badge/-Google%20Group-lightgrey.svg)](https://groups.google.com/forum/#!forum/jupyter)
 [![Build Status](https://travis-ci.org/jupyter/notebook.svg?branch=master)](https://travis-ci.org/jupyter/notebook)
 [![Documentation Status](https://readthedocs.org/projects/jupyter-notebook/badge/?version=latest)](https://jupyter-notebook.readthedocs.io/en/latest/?badge=latest)
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 英語版のリンク : [[English Version](http://github.com/jupyter/notebook/)]
 
 Jupyter Notebook は、インタラクティブな Web ベースのノートブック形式の環境です。

docs-translations/ko-KR/README.md

@@ -3,7 +3,7 @@
 [![Google Group](https://img.shields.io/badge/-Google%20Group-lightgrey.svg)](https://groups.google.com/forum/#!forum/jupyter)
 [![Build Status](https://travis-ci.org/jupyter/notebook.svg?branch=master)](https://travis-ci.org/jupyter/notebook)
 [![Documentation Status](https://readthedocs.org/projects/jupyter-notebook/badge/?version=latest)](http://jupyter-notebook.readthedocs.io/en/latest/?badge=latest)
-  
+
 English 버전 링크 : [[English Version](http://github.com/jupyter/notebook/)]
 
 Jupyter notebook 은 상호 교환을 위한 웹 기반 환경입니다.