DOC: Make pyplot import explicit in the 10 minutes to pandas page

[ghost]

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

[WillAyd]

I think should unhide this where it appears later in the guide rather than import here

[datapythonista]

@yuseitahara do you mind translating your last comment to English please, so we can understand it.

The solution here to remove the block with the :suppress: and add the import at the beginning of the only block where plt is used.

If you can't edit this PR from the GitHub UI, you should clone the pandas repo locally, and edit there.

[yuseitahara]

@datapythonista Thank you for your comment. My previous comment written in Japanese was for @Koki-kobe whom I helped during an OSS event to submit this PR since he was a beginner and what I wrote was about how to fix his PR as you wrote above. It seems that he does not notice this conversation unfortunately. Since I do not have a right to edit this PR, if you do not mind, could you please close this PR? Then I will make a new PR. Thank you.

[datapythonista]

Thanks for clarifying @yuseitahara

Closing as requested.