Local tests script for contribution not executing `cargo doc`

[rish-singhal]

The contribution guideline file https://github.com/rust-bitcoin/rust-bitcoin/blob/master/CONTRIBUTING.md suggests that there exist a script ci.sh

BITCOIN_MSRV=1.29.0 ./contrib/ci.sh

But I couldn't find this file in the repository, so I opened the contrib directory and found out test.sh. Recently, in my PR, I found out that docs tests were failing on github. But locally running ./contrib/test.sh did not pointed out that.

I believe cargo doc is not being executed in ./contrib/test.sh script for local testing. I am not sure if ./contrib/test.sh was supposed to check documentation tests too.

[apoelstra]

Yes, both of these are bugs:

• contributing.md should have the correct filename, test.sh
• test.sh should be able to run the doc tests (should be gated by an environment var, similar to the existing fuzztests etc)