chore: clearer doc for python binding

[wcy-fdu]

💦
It's better to use s3 as an example in the documentation than fs.

[Zheaoli]

I think maybe we don't need this doc change.

The fs service in demo is the most simple way to help people to understand the interface what we provide for the language binding as fast as they can. So I think it's not good for me change it to s3. The develoepr don't need to know anything about S3 when they use the opendal in first time.

BTW, you can see that there is fs demo in all of the language binding we provide.

WDYT @Xuanwo

[Xuanwo]

LGTM!

[Xuanwo]

cc @Zheaoli, would you like to take another review?

[wcy-fdu]

I think maybe we don't need this doc change.

The fs service in demo is the most simple way to help people to understand the interface what we provide for the language binding as fast as they can. So I think it's not good for me change it to s3. The develoepr don't need to know anything about S3 when they use the opendal in first time.

BTW, you can see that there is fs demo in all of the language binding we provide.

WDYT @Xuanwo

I prefer to add a specific object store service in python doc because user may use python to write some CI or test scripts, so I add it.

[Zheaoli]

LGTM