Fix typos

exercises/01_variables/variables5.rs

@@ -2,7 +2,7 @@ fn main() {
     let number = "T-H-R-E-E"; // Don't change this line
     println!("Spell a number: {}", number);
 
-    // TODO: Fix the compiler error by changing the line below without renaming the the variable.
+    // TODO: Fix the compiler error by changing the line below without renaming the variable.
     number = 3;
     println!("Number plus two is: {}", number + 2);
 }

src/main.rs

@@ -151,7 +151,7 @@ fn main() -> Result<()> {
             let notify_exercise_names = if args.manual_run {
                 None
             } else {
-                // For the the notify event handler thread.
+                // For the notify event handler thread.
                 // Leaking is not a problem because the slice lives until the end of the program.
                 Some(
                     &*app_state