Bug 1537576 - fix some rust-nightly warnings about unused doc comments. r=boris

Differential Revision: https://phabricator.services.mozilla.com/D24287

--HG--
extra : moz-landing-system : lando

servo/components/style/bloom.rs

@@ -14,11 +14,13 @@ use selectors::bloom::BloomFilter;
 use servo_arc::Arc;
 use smallvec::SmallVec;
 
-/// Bloom filters are large allocations, so we store them in thread-local storage
-/// such that they can be reused across style traversals. StyleBloom is responsible
-/// for ensuring that the bloom filter is zeroed when it is dropped.
-thread_local!(static BLOOM_KEY: Arc<AtomicRefCell<BloomFilter>> =
-              Arc::new(AtomicRefCell::new(BloomFilter::new())));
+thread_local! {
+    /// Bloom filters are large allocations, so we store them in thread-local storage
+    /// such that they can be reused across style traversals. StyleBloom is responsible
+    /// for ensuring that the bloom filter is zeroed when it is dropped.
+    static BLOOM_KEY: Arc<AtomicRefCell<BloomFilter>> =
+              Arc::new(AtomicRefCell::new(BloomFilter::new()));
+}
 
 /// A struct that allows us to fast-reject deep descendant selectors avoiding
 /// selector-matching.

servo/components/style/font_face.rs

@@ -545,7 +545,6 @@ macro_rules! font_face_descriptors {
     }
 }
 
-/// css-name rust_identifier: Type,
 #[cfg(feature = "gecko")]
 font_face_descriptors! {
     mandatory descriptors = [

servo/components/style/gecko/media_features.rs

@@ -369,8 +369,8 @@ fn eval_prefers_color_scheme(device: &Device, query_value: Option<PrefersColorSc
     }
 }
 
-/// https://drafts.csswg.org/mediaqueries-4/#mf-interaction
 bitflags! {
+    /// https://drafts.csswg.org/mediaqueries-4/#mf-interaction
     struct PointerCapabilities: u8 {
         const COARSE = structs::PointerCapabilities_Coarse;
         const FINE = structs::PointerCapabilities_Fine;

servo/components/style/stylist.rs

@@ -60,8 +60,8 @@ pub type StylistSheet = crate::stylesheets::DocumentStyleSheet;
 #[cfg(feature = "gecko")]
 pub type StylistSheet = crate::gecko::data::GeckoStyleSheet;
 
-/// A cache of computed user-agent data, to be shared across documents.
 lazy_static! {
+    /// A cache of computed user-agent data, to be shared across documents.
     static ref UA_CASCADE_DATA_CACHE: Mutex<UserAgentCascadeDataCache> =
         Mutex::new(UserAgentCascadeDataCache::new());
 }