[ci] Fail 'Build docs' job if warnings

.github/workflows/nightly_docs.yml

@@ -27,7 +27,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: rustdoc
-          args: --verbose --features=compiler,electrum,esplora,compact_filters,key-value-db,all-keys -- --cfg docsrs
+          args: --verbose --features=compiler,electrum,esplora,compact_filters,key-value-db,all-keys -- --cfg docsrs -Dwarnings
       - name: Upload artifact
         uses: actions/upload-artifact@v2
         with:

src/keys/mod.rs

@@ -420,7 +420,7 @@ where
 /// [`ToDescriptorKey`]: the generated keys can be directly used in descriptors if `Self` is also
 /// [`ToDescriptorKey`].
 pub trait GeneratableKey<Ctx: ScriptContext>: Sized {
-    /// Type specifying the amount of entropy required e.g. [u8;32]
+    /// Type specifying the amount of entropy required e.g. `[u8;32]`
     type Entropy: AsMut<[u8]> + Default;
 
     /// Extra options required by the `generate_with_entropy`