Tweak some CI things for unstable APIs

Cargo.toml

@@ -15,7 +15,6 @@ edition = "2018"
 
 [package.metadata.docs.rs]
 features = ["serde-serialize"]
-rustc-args = ["--cfg=web_sys_unstable_apis"]
 
 [lib]
 test = false

azure-pipelines.yml

@@ -328,7 +328,7 @@ jobs:
       - script: cargo doc --no-deps --manifest-path crates/web-sys/Cargo.toml --all-features
         displayName: "Document web-sys"
         env:
-          RUSTFLAGS: --cfg=web_sys_unstable_apis
+          RUSTDOCFLAGS: --cfg=web_sys_unstable_apis
       - script: cargo doc --no-deps --manifest-path crates/futures/Cargo.toml
         displayName: "Document wasm-bindgen-futures"
       # Make a tarball even though a zip is uploaded, it looks like the tarball

crates/web-sys/Cargo.toml

@@ -14,6 +14,7 @@ edition = "2018"
 
 [package.metadata.docs.rs]
 all-features = true
+rustdoc-args = ["--cfg=web_sys_unstable_apis"]
 
 [lib]
 doctest = false