chore: remove redundant words in comment

Signed-off-by: pudongair <744355276@qq.com>

Author: pudongair

compiler/rustc_error_codes/src/error_codes/E0207.md

@@ -195,7 +195,7 @@ impl<'a> Contains for Foo {
 Please note that unconstrained lifetime parameters are not supported if they are
 being used by an associated type.
 
-In cases where the associated type's lifetime is meant to be tied to the the
+In cases where the associated type's lifetime is meant to be tied to the
 self type, and none of the methods on the trait need ownership or different
 mutability, then an option is to implement the trait on a borrowed type:
 

library/core/src/clone.rs

@@ -427,7 +427,7 @@ pub unsafe trait CloneToUninit {
     /// read or dropped, because even if it was previously valid, it may have been partially
     /// overwritten.
     ///
-    /// The caller may wish to to take care to deallocate the allocation pointed to by `dest`,
+    /// The caller may wish to take care to deallocate the allocation pointed to by `dest`,
     /// if applicable, to avoid a memory leak (but this is not a requirement).
     ///
     /// Implementors should avoid leaking values by, upon unwinding, dropping all component values