improve first line of module docs

src/consts.rs

@@ -14,7 +14,7 @@
 // <https://opensource.org/licenses/MIT>.
 
 /*!
-This module contains constants.
+Mathematical constants.
 
 The constants have the maximum precision possible for a fixed-point
 number, and are rounded down at that precision.

src/lib.rs

@@ -287,12 +287,12 @@ use core::{
     mem,
 };
 
-/// A prelude for users of the *fixed* crate.
+/// A prelude to import useful traits.
 ///
-/// This prelude is similar to the [standard library’s
+/// This prelude is similar to the
-/// prelude][prelude] in that you’ll almost always want to import its
+/// [standard library’s prelude][prelude] in that you’ll almost always
-/// entire contents, but unlike the standard library’s prelude you’ll
+/// want to import its entire contents, but unlike the standard
-/// have to do so manually:
+/// library’s prelude you’ll have to do so manually:
 ///
 /// ```
 /// # #[allow(unused_imports)]

src/traits.rs

@@ -14,7 +14,7 @@
 // <https://opensource.org/licenses/MIT>.
 
 /*!
-This module contains traits.
+Traits for conversions and for generic use of fixed-point numbers.
 */
 
 use crate::{

src/types/mod.rs

@@ -14,8 +14,7 @@
 // <https://opensource.org/licenses/MIT>.
 
 /*!
-This module provides type aliases for all supported fixed-point
+Type aliases for all supported fixed-point numbers.
-numbers.
 */
 
 use crate::{