Fix comment

Author: edwin0cheng

crates/ra_hir_def/src/nameres/collector.rs

@@ -360,7 +360,7 @@ where
         import: &raw::ImportData,
         status: PartialResolvedImport,
     ) {
-        // record import if it was changed
+        // Skip record import if it is unchanged
         if let PartialResolvedImport::Resolved(ns) = status {
             if ns == def {
                 return;