* docs: fix tab value and label

* docs: fix tab value and label

* docs: add dbname note in grafa and fix lots of unicode characters in english doc

* build: update writing kafka example and document

* fixes kafka demo

* fix: refine wording

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Co-authored-by: Shuduo Sang <sangshuduo@gmail.com>

* doc: writting from kafka

* rename file

* docs: typo fix
Co-authored-by: Shuduo Sang <sangshuduo@gmail.com>