chore: make finishing touches on comments

Co-authored-by: Antoine du Hamel <[email protected]>

Author: Theo-Steiner

lib/internal/readline/interface.js

@@ -1323,17 +1323,17 @@ class Interface extends InterfaceConstructor {
         default:
           if (typeof s === 'string' && s) {
             let nextMatch = RegExpPrototypeExec(lineEnding, s);
-            // If no line endings are found, just insert the string as is
+            // If no line endings are found, just insert the string as is.
             if (nextMatch === null) {
               this[kInsertString](s);
             } else {
-              // Keep track of the end of the last match
+              // Keep track of the end of the last match.
               let lastIndex = 0;
               do {
                 this[kInsertString](StringPrototypeSlice(s, lastIndex, nextMatch.index));
                 ({ lastIndex } = lineEnding);
                 this[kLine]();
-                // Restore lastIndex locally as the RegExp's state might have been overwritten by recursive calls
+                // Restore lastIndex as the call to kLine could have mutated it.
                 lineEnding.lastIndex = lastIndex;
               } while ((nextMatch = RegExpPrototypeExec(lineEnding, s)) !== null);
             }