Fix broken links

[adcdr]

The documentation linked below contains 3 rendering errors:
https://jupyter-notebook.readthedocs.io/en/stable/examples/Notebook/What%20is%20the%20Jupyter%20Notebook.html

These are caused by limitations in the Sphinx tool used to render the page:
https://docutils.sourceforge.io/FAQ.html#is-nested-inline-markup-possible

This PR fixes them with the least amount of changes.

[adcdr]

The Travis-CI seems to have failed because of a missing node file, this may be fixed by deleting the package.lock file then reinstalling the dependencies.

However I am confident this isn't caused by my changes.

npm ERR! enoent ENOENT: no such file or directory, rename '/home/travis/.nvm/versions/node/v6.9.2/lib/node_modules/.staging/@npmcli/ci-detect-45051f7f' -> '/home/travis/.nvm/versions/node/v6.9.2/lib/node_modules/npm/node_modules/@npmcli/ci-detect'

npm ERR! enoent ENOENT: no such file or directory, rename '/home/travis/.nvm/versions/node/v6.9.2/lib/node_modules/.staging/@npmcli/ci-detect-45051f7f' -> '/home/travis/.nvm/versions/node/v6.9.2/lib/node_modules/npm/node_modules/@npmcli/ci-detect'

npm ERR! enoent This is most likely not a problem with npm itself

npm ERR! enoent and is related to npm not being able to find a file.

npm ERR! enoent 

npm ERR! Please include the following file with any support request:

npm ERR!     /home/travis/build/jupyter/notebook/npm-debug.log

npm ERR! code 1

The command "npm upgrade -g npm" failed and exited with 1 during .

[kevin-bates]

Great catch - thank you. Yeah, nothing to do with the npm issues which someone has contributed the change for.