Failed to build reqwest v0.11.15 doc

[NobodyXu]

From docs.rs:

[INFO] [stderr]     If you want Rustdoc to scrape these examples, then add `doc-scrape-examples = true`
[INFO] [stderr]     to the [[example]] target configuration of at least one example.
[INFO] [stderr] warning: Target filter specified, but no targets matched. This is a no-op
[INFO] [stderr]  Documenting reqwest v0.11.15 (/opt/rustwide/workdir)
[INFO] [stderr] error: The `http3` feature is unstable, and requires the `RUSTFLAGS='--cfg reqwest_unstable'` environment variable to be set.
[INFO] [stderr]    --> src/lib.rs:223:1
[INFO] [stderr]     |
[INFO] [stderr] 223 | / compile_error!(
[INFO] [stderr] 224 | |     "\
[INFO] [stderr] 225 | |     The `http3` feature is unstable, and requires the \
[INFO] [stderr] 226 | |     `RUSTFLAGS='--cfg reqwest_unstable'` environment variable to be set.\
[INFO] [stderr] 227 | | "
[INFO] [stderr] 228 | | );
[INFO] [stderr]     | |_^
[INFO] [stderr] 
[INFO] [stderr] error: could not document `reqwest`
[INFO] [stderr] 
[INFO] [stderr] Caused by:

[samueltardieu]

@seanmonstar Is a point release scheduled to fix the docs issue? All the doc links, for example in lab sessions, are unavailable right now.

[seanmonstar]

I just published 0.11.16 to trigger a new docs build.