Fix the documentation of gstd on crates.io

[clearloop]

Problem to Solve

docs.rs failed to build the docs of gstd build logs: https://docs.rs/crate/gstd/1.0.2/builds/1051841, bcz the document-features feature https://github.com/gear-tech/gear/blob/master/gstd/src/lib.rs#L32-L35

Possible Solution

mb we need to provide

[features]
document-features = ["dep:document-features"]

or checkout the reason from the commands that docs.rs building our docs

Notes

No response

[StackOverflowExcept1on]

I think this is caused by modifying Cargo.toml file of gstd in crates-io-manager. It uses cargo_toml dep which probably removes the "# comments" from the original Cargo.toml file.