CI: don't pass docsrs feature to cargo doc

One dependency has docs that make nightly rustdoc fail,
while others require nightly with the "docsrs" feature.

.github/workflows/rust.yml

@@ -57,6 +57,4 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
-      - env:
-          RUSTDOCFLAGS: "--cfg docsrs"
-        run: cargo doc --all-features
+      - run: cargo doc --all-features

tendermint/Cargo.toml

@@ -26,7 +26,8 @@ authors = [
 
 [package.metadata.docs.rs]
 all-features = true
-rustdoc-args = ["--cfg", "docsrs"]
+# Enable when the num-traits dependency builds with nightly
+#rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
 bytes = { version = "1.2", default-features = false, features = ["serde"] }