Update pure_new option comment

lib/terser.rb

@@ -79,7 +79,7 @@ class Error < StandardError; end
       :negate_iife => true, # Negate immediately invoked function expressions to avoid extra parens
       :pure_getters => false, # Assume that object property access does not have any side-effects
       :pure_funcs => nil, # List of functions without side-effects. Can safely discard function calls when the result value is not used
-      :pure_new => false, # List of functions without side-effects. Can safely discard function calls when the result value is not used
+      :pure_new => false, # If objects generated by the new keyword are not used for other purposes, removes those objects
       :drop_console => false, # Drop calls to console.* functions
       :keep_fargs => false, # Preserve unused function arguments
       :keep_classnames => false, # Prevents discarding or mangling of class names. Pass a regular expression to only keep class names matching that regex.