[data_request] improve DataRequest method summary documentation

src/data_request.rs

@@ -69,57 +69,43 @@ impl DataRequest {
         DataRequest::from_bool(false)
     }
 
-    /// Returns a mutable reference to a [DataRequest] that includes
-    /// glyph layers and points if `b` is `true` or excludes these
-    /// data if `b` is `false`.
+    /// Specify whether layers (and glyphs) should be loaded.
     pub fn layers(&mut self, b: bool) -> &mut Self {
         self.layers = b;
         self
     }
 
-    /// Returns a mutable reference to a [DataRequest] that includes
-    /// parsed lib.plist data if `b` is `true` or excludes these
-    /// data if `b` is `false`.
+    /// Specify whether parsed lib.plist data should be loaded.
     pub fn lib(&mut self, b: bool) -> &mut Self {
         self.lib = b;
         self
     }
 
-    /// Returns a mutable reference to a [DataRequest] that includes
-    /// parsed groups.plist data if `b` is `true` or excludes these
-    /// data if `b` is `false`.
+    /// Specify whether parsed groups.plist data should be loaded.
     pub fn groups(&mut self, b: bool) -> &mut Self {
         self.groups = b;
         self
     }
 
-    /// Returns a mutable reference to a [DataRequest] that includes
-    /// parsed kerning.plist data if `b` is `true` or excludes these
-    /// data if `b` is `false`.
+    /// Specify whether parsed kerning.plist data should be loaded.
     pub fn kerning(&mut self, b: bool) -> &mut Self {
         self.kerning = b;
         self
     }
 
-    /// Returns a mutable reference to a [DataRequest] that includes
-    /// OpenType Layout features in Adobe .fea format if `b` is `true`
-    /// or excludes these data if `b` is `false`.
+    /// Specify whether Adobe OpenType feature syntax (.fea) data should be loaded.
     pub fn features(&mut self, b: bool) -> &mut Self {
         self.features = b;
         self
     }
 
-    /// Returns a mutable reference to a [DataRequest] that includes
-    /// UFO data if `b` is true and excludes these data if `b` is
-    /// `false`.
+    /// Specify whether arbitrary data should be loaded.
     pub fn data(&mut self, b: bool) -> &mut Self {
         self.data = b;
         self
     }
 
-    /// Returns a mutable reference to a [DataRequest] that includes
-    /// images data if `b` is true and excludes these data if `b` is
-    /// `false`.
+    /// Specify whether image data should be loaded.
     pub fn images(&mut self, b: bool) -> &mut Self {
         self.images = b;
         self