Re-word configuration error messages

This now corresponds more closely to the original error.

Author: badeball

features/suite_only_options.feature

@@ -79,7 +79,7 @@ Feature: suite only options
       Then it fails
       And the output should contain
         """
-        Tag testIsolation can only be used on a Feature or a Rule
+        The `testIsolation` configuration can only be overridden from a suite-level override (in Cucumber-terms this means on a Feature or Rule).
         """
 
     Scenario: Configuring testIsolation on a Scenario Outline
@@ -105,7 +105,7 @@ Feature: suite only options
       Then it fails
       And the output should contain
         """
-        Tag testIsolation can only be used on a Feature or a Rule
+        The `testIsolation` configuration can only be overridden from a suite-level override (in Cucumber-terms this means on a Feature or Rule).
         """
 
     Scenario: Configuring testIsolation on Examples
@@ -131,5 +131,5 @@ Feature: suite only options
       Then it fails
       And the output should contain
         """
-        Tag testIsolation can only be used on a Feature or a Rule
+        The `testIsolation` configuration can only be overridden from a suite-level override (in Cucumber-terms this means on a Feature or Rule).
         """

lib/browser-runtime.ts

@@ -459,7 +459,7 @@ function createPickle(context: CompositionContext, pickle: messages.Pickle) {
   for (const entry of testSpecificOptions) {
     if (isExclusivelySuiteConfiguration(entry)) {
       throw new Error(
-        `Tag ${entry[0]} can only be used on a Feature or a Rule`
+        `The \`${entry[0]}\` configuration can only be overridden from a suite-level override (in Cucumber-terms this means on a Feature or Rule).`
       );
     }
   }