### _Why are the changes needed?_
- Extract common assertion method for verifying file contents
- Ensure integrity of the file by comparing the line count
- Correct the script name for Spark engine KDF doc generation from `gen_kdf.sh` to `gen_spark_kdf_docs.sh`
- Add `gen_hive_kdf_docs.sh` script for Hive engine KDF doc generation
- Fix incorrect hints for Ranger spec file generation
- shows the line number of the incorrect file content
- Streamingly read file content by line with buffered support
- Regeneration hints:
<img width="656" alt="image" src="https://github.com/apache/kyuubi/assets/1935105/d1a7cb70-8b63-4fe9-ae27-80dadbe84799">
### _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
- [x] [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?_
No.
Closes#5275 from bowenliang123/doc-regen-hint.
Closes#5275
9af97ab86 [Bowen Liang] implicit source position
07020c74d [liangbowen] assertFileContent
Lead-authored-by: liangbowen <liangbowen@gf.com.cn>
Co-authored-by: Bowen Liang <liangbowen@gf.com.cn>
Signed-off-by: Bowen Liang <liangbowen@gf.com.cn>
d15322d568