[doc]: ask the motivation of the PR (#4462)

it is important to understand the motivation of the PR.

what I did is usually the PR title, so remove.

Signed-off-by: Guohan Lu <lguohan@gmail.com>
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lguohan 2020-04-22 11:02:38 -07:00 committed by GitHub
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@ -10,7 +10,7 @@ If this is a bug fix, make sure your description includes "fixes #xxxx", or
Please provide the following information:
-->
**- What I did**
**- Why I did it**
**- How I did it**