Opt out -Zrustdoc-scrape-examples on docs.rs

I'd like a chance to audit all the code that rustdoc is inserting into
the docs. Currently I am skeptical that showing anyhow's internal usages
of APIs is a net benefit to the public documentation. I am also
skeptical that quite so many examples are needed, and that they should
be featured so prominently in comparison to handwritten docs. Lastly I
wish there were a way to turn this behavior off on a more granular
basis.

Cargo.toml

@@ -25,6 +25,9 @@ syn = { version = "1.0", features = ["full"] }
 thiserror = "1.0"
 trybuild = { version = "1.0.66", features = ["diff"] }
 
+[lib]
+doc-scrape-examples = false
+
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]
 rustdoc-args = ["--cfg", "doc_cfg"]