[Docs] add the websites about geojson in map tutorial

[xile611]

https://visactor.com/vchart/guide/tutorial_docs/Chart_Types/Map

such as

• https://geojson-maps.kyd.au/
• https://mapshaper.org/

[xiaoluoHe]

recommend this page https://cloudcenter.tianditu.gov.cn/administrativeDivision

[mengxi-ream]

recommend this page cloudcenter.tianditu.gov.cn/administrativeDivision

Hi, I met this error code when I accessed it in Canada by Chrome

418
Sorry, your request has been intercepted because it appears to be an attack.
Event ID:32-12-137-20240616033455-4e2eed13

If you are the webmaster, configure related parameters on the WAF console to allow your requests.

[afkdsghk211331]

我想认领这个issue