[KYUUBI #5335] Set markdown file EOL

### _Why are the changes needed?_

Set markdown file EOL avoids spotless check failure in windows.

### _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/master/contributing/code/testing.html#running-tests) locally before make a pull request

### _Was this patch authored or co-authored using generative AI tooling?_

Closes #5335 from wForget/dev.

Closes #5335

7be3ae5 [wforget] Set markdown file EOL

Authored-by: wforget <[email protected]>
Signed-off-by: Shaoyun Chen <[email protected]>

.gitattributes

@@ -26,6 +26,7 @@ NOTICE-binary export-ignore
 *.bat text eol=crlf
 *.cmd text eol=crlf
 *.java text eol=lf
+*.md text eol=lf
 *.scala text eol=lf
 *.xml text eol=lf
 *.py text eol=lf