### _Why are the changes needed?_ - to consolidate styles in markdown files from manual written or auto-generated - apply markdown formatting rules with flexmark from [spotless-maven-plugin](https://github.com/diffplug/spotless/tree/main/plugin-maven#markdown) to *.md files in `/docs` - use `flexmark` to format markdown generation in `TestUtils` of common module used by `AllKyuubiConfiguration` and `KyuubiDefinedFunctionSuite`, as the same way in `FlexmarkFormatterFunc ` of `spotless-maven-plugin` using with `COMMONMARK` as `FORMATTER_EMULATION_PROFILE` (https://github.com/diffplug/spotless/blob/maven/2.30.0/lib/src/flexmark/java/com/diffplug/spotless/glue/markdown/FlexmarkFormatterFunc.java) - using `flexmark` of` 0.62.2`, as the last version requiring Java 8+ (checked from pom file and bytecode version) ``` <markdown> <includes> <include>docs/**/*.md</include> </includes> <flexmark></flexmark> </markdown> ``` - Changes applied to markdown doc files, - no style change or breakings in built docs by `make html` - removal all the first blank in licences and comments to conform markdown style rules - tables regenerated by flexmark following as in [GitHub Flavored Markdown](https://help.github.com/articles/organizing-information-with-tables/) (https://github.com/vsch/flexmark-java/wiki/Extensions#tables) ### _How was this patch tested?_ - [x] regenerate docs using `make html` successfully and check all the markdown pages available - [x] regenerate `settings.md` and `functions.md` by `AllKyuubiConfiguration` and `KyuubiDefinedFunctionSuite`, and pass the checks by both themselves and spotless check via `dev/reformat` - [x] [Run test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests) locally before make a pull request Closes #4200 from bowenliang123/markdown-formatting. Closes #4200 1eeafce4 [liangbowen] revert minor changes in AllKyuubiConfiguration 4f892857 [liangbowen] use flexmark in markdown doc generation 8c978abd [liangbowen] changes on markdown files a9190556 [liangbowen] apply markdown formatting rules with `spotless-maven-plugin` to markdown files with in `/docs` Authored-by: liangbowen <liangbowen@gf.com.cn> Signed-off-by: liangbowen <liangbowen@gf.com.cn>
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