Remove repeated definite articles

Signed-off-by: cui fliter <imcusg@gmail.com>

Author: cuishuang

library/core/src/macros/panic.md

@@ -42,7 +42,7 @@ the successful result of some computation, `Ok(T)`, or error types that
 represent an anticipated runtime failure mode of that computation, `Err(E)`.
 `Result` is used alongside user defined types which represent the various
 anticipated runtime failure modes that the associated computation could
-encounter. `Result` must be propagated manually, often with the the help of the
+encounter. `Result` must be propagated manually, often with the help of the
 `?` operator and `Try` trait, and they must be reported manually, often with
 the help of the `Error` trait.
 

tests/debuginfo/thread.rs

@@ -1,4 +1,4 @@
-// Testing the the display of JoinHandle and Thread in cdb.
+// Testing the display of JoinHandle and Thread in cdb.
 
 // cdb-only
 // min-cdb-version: 10.0.18317.1001

tests/ui/generic-associated-types/self-outlives-lint.rs

@@ -189,7 +189,7 @@ trait MultipleMethods {
 }
 
 // We would normally require `Self: 'a`, but we can prove that `Self: 'static`
-// because of the the bounds on the trait, so the bound is proven
+// because of the bounds on the trait, so the bound is proven
 trait Trait: 'static {
     type Assoc<'a>;
     fn make_assoc(_: &u32) -> Self::Assoc<'_>;