Merge master branch of vscode-docs project

[masanori1102]

This project is translating the documents under the release-notes directory of the Microsoft/vscode-docs project.
Therefore, it is necessary to merge changes periodically by the following command.

$ cd {This project's WorkingCopy}
$ git checkout -b issues/2 origin/master
$ git remote add upstream https://github.com/Microsoft/vscode-docs.git
$ git fetch --prune --all
$ git merge --allow-unrelated-histories upstream/master