nits by me

Author: Kivooeo

src/doc/book

@@ -1,4 +1,4 @@
-//! Closures do not implement `Copy` when they capture mutable references.
+//! Checks taht losures do not implement `Copy` when they capture mutable references.
 
 fn main() {
     let mut a = 5;

src/doc/embedded-book

@@ -1,4 +1,4 @@
-//! Ensure clean diagnostics for argument count mismatches without unrelated errors.
+//! Checks clean diagnostics for argument count mismatches without unrelated errors.
 //!
 //! `delegate!` part related: <https://github.com/rust-lang/rust/pull/140591>
 

src/doc/reference

@@ -1,4 +1,4 @@
-//! Different NUL character representations are equivalent in strings and chars.
+//! Checks different NUL character representations are equivalent in strings and chars.
 
 //@ run-pass
 

src/doc/rust-by-example

@@ -1,4 +1,4 @@
-//! Method availability rules for trait objects depend on receiver type.
+//! Checks that method availability rules for trait objects depend on receiver type.
 
 trait Foo {
     fn borrowed(&self);

tests/ui/closures/closure-no-copy-mut-env.rs

@@ -1,4 +1,4 @@
-//! Coercion from `&mut dyn Trait` to `&dyn Trait` works correctly.
+//! Tests that coercion from `&mut dyn Trait` to `&dyn Trait` works correctly.
 
 //@ run-pass