Update 10min.rst
Added Links for Matplotlib Close along with a line explaining what it does.
I had faced difficulty when I read it for the first time and had to google search what close does

- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hey! 
Can someone explain what went wrong. This is the first time I used Sphinx directly but it seems to fail and I can't understand why @jbrockmendel 
Hey
I saw your contributions and commits on the top page 
I want some help here can you tell me what's going wrong and causing all this fail? Near the bottom of the page there is a red x for the "pre-commit" CI check.  click on the "details" link to see the logs for the failed check.  There is a line that the code-check wants to see changed, I think it just wants some whitespace removed. Thank You @jbrockmendel  @jbrockmendel 
Hey I'd like to apologize in case my message was aggressive to say the least. Someone pointed it out to me and I am just starting but that is no excuse so I will try my best to keep this in mind in the future.
Thank You for all the help though Looks like the code check passed this time around.  Good job.  Someone more familiar with the docs will come along to review this before too long. thanks @aflah02  @jreback You're Welcome