Update 1-percentage-change.js

Fix explanation for percentage-change.js syntax error

Author: lamlakamana-oss

Sprint-2/3-mandatory-interpret/1-percentage-change.js

@@ -27,8 +27,11 @@ console.log(`The percentage change is ${percentageChange}`);
 //    Line 10: console.log(...)
 //
 // b) The error showed up on Line 5. It said "SyntaxError: missing ) after
-//    argument list". That just means I had one too many closing brackets ( ) )
-//    at the end of that line.
+//    argument list". This happened because there was a missing comma between
+//    the two arguments inside .replaceAll("," "") — JavaScript needs a comma
+//    separating each argument in a function call. Without it, JavaScript
+//    couldn't tell where one argument ended and the next began, so it
+//    reported a missing ), even though the real issue was the missing comma.
 //
 // c) There are 2 lines where a variable gets a new value (reassignment):
 //    Line 4: carPrice = ...
@@ -41,4 +44,4 @@ console.log(`The percentage change is ${percentageChange}`);
 //    First, replaceAll(",", "") takes out all the commas from the text, so
 //    "10,000" turns into "10000".
 //    Then, Number(...) changes that text into a real number (10000), so we
-//    can do maths with it instead of treating it like a word.
+//    can do maths with it instead of treating it like a word.