Improve grammar in execution error messages (#3068)

Author: Cito

src/execution/__tests__/abstract-test.js

@@ -557,11 +557,11 @@ describe('Execute: Handles execution of abstract types', () => {
     );
 
     expectError({ forTypeName: 'Human' }).toEqual(
-      'Abstract type "Pet" was resolve to a type "Human" that does not exist inside schema.',
+      'Abstract type "Pet" was resolved to a type "Human" that does not exist inside the schema.',
     );
 
     expectError({ forTypeName: 'String' }).toEqual(
-      'Abstract type "Pet" was resolve to a non-object type "String".',
+      'Abstract type "Pet" was resolved to a non-object type "String".',
     );
 
     expectError({ forTypeName: '__Schema' }).toEqual(

src/execution/execute.js

@@ -984,14 +984,14 @@ function ensureValidRuntimeType(
   const runtimeType = exeContext.schema.getType(runtimeTypeName);
   if (runtimeType == null) {
     throw new GraphQLError(
-      `Abstract type "${returnType.name}" was resolve to a type "${runtimeTypeName}" that does not exist inside schema.`,
+      `Abstract type "${returnType.name}" was resolved to a type "${runtimeTypeName}" that does not exist inside the schema.`,
       fieldNodes,
     );
   }
 
   if (!isObjectType(runtimeType)) {
     throw new GraphQLError(
-      `Abstract type "${returnType.name}" was resolve to a non-object type "${runtimeTypeName}".`,
+      `Abstract type "${returnType.name}" was resolved to a non-object type "${runtimeTypeName}".`,
       fieldNodes,
     );
   }