change comment wording

Author: jonchurch

index.js

@@ -137,7 +137,7 @@ function createClientErrorConstructor (HttpError, name, code) {
     // capture a stack trace to the construction point
     Error.captureStackTrace(err, ClientError)
 
-    // adjust the [[Prototype]] if new.target is not ClientError
+    // adjust the [[Prototype]] if new.target is not this class
     if (new.target && new.target !== ClientError) {
       setPrototypeOf(err, new.target.prototype)
     }
@@ -208,7 +208,7 @@ function createServerErrorConstructor (HttpError, name, code) {
     // capture a stack trace to the construction point
     Error.captureStackTrace(err, ServerError)
 
-    // adjust the [[Prototype]] if new.target is not ClientError
+    // adjust the [[Prototype]] if new.target is not this class
     if (new.target && new.target !== ServerError) {
       setPrototypeOf(err, new.target.prototype)
     }