[KYUUBI #1808] Update the link in the PULL_REQUEST_TEMPLATE

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### _Why are the changes needed?_
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Please clarify why the changes are needed. For instance,
  1. If you add a feature, you can talk about the use case of it.
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### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #1808 from cfmcgrady/pr-template.

Closes #1808

1cf96ec [Fu Chen] update the link in the PULL_REQUEST_TEMPLATE

Authored-by: Fu Chen <cfmcgrady@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>

Author: cfmcgrady

.github/PULL_REQUEST_TEMPLATE

@@ -20,4 +20,4 @@ Please clarify why the changes are needed. For instance,
 
 - [ ] Add screenshots for manual tests if appropriate
 
-- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
+- [ ] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request