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### _Why are the changes needed?_
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Update ANNOUNCE mail template to add more detailed descriptions of Kyuubi.
### _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#1158 from pan3793/ann.
Closes#1158
46c19975 [Cheng Pan] typo
a87321f5 [Cheng Pan] [INFRA] Update ANNOUNCE mail template
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: ulysses-you <ulyssesyou@apache.org>
d621e50e58