Fix a bunch of typo

This PR will fix some typos detected by [typos].

I only picked the ones I was sure were spelling errors to fix, mostly in
the comments.

[typos]: https://github.com/crate-ci/typos

compiler/rustc_target/src/spec/mod.rs

@@ -2309,7 +2309,7 @@ impl Target {
                 load_builtin(target_triple).expect("built-in target")
             }
             TargetTriple::TargetJson { .. } => {
-                panic!("built-in targets doens't support target-paths")
+                panic!("built-in targets doesn't support target-paths")
             }
         }
     }