make tidy slightly less noisy

Author: RalfJung

src/tools/tidy/src/error_codes.rs

@@ -95,7 +95,7 @@ fn check_removed_error_code_explanation(ci_info: &crate::CiInfo, bad: &mut bool)
         eprintln!("Take a look at E0001 to see how to handle it.");
         return;
     }
-    println!("No error code explanation was removed!");
+    // All good, no error code explanation was removed.
 }
 
 /// Stage 1: Parses a list of error codes from `error_codes.rs`.

src/tools/tidy/src/rustdoc_json.rs

@@ -16,7 +16,6 @@ pub fn check(src_path: &Path, ci_info: &crate::CiInfo, bad: &mut bool) {
     // First we check that `src/rustdoc-json-types` was modified.
     if !crate::files_modified(ci_info, |p| p == RUSTDOC_JSON_TYPES) {
         // `rustdoc-json-types` was not modified so nothing more to check here.
-        println!("`rustdoc-json-types` was not modified.");
         return;
     }
     // Then we check that if `FORMAT_VERSION` was updated, the `Latest feature:` was also updated.