Avoid an before consonant (graphql#3823)

Author: spawnia

src/execution/__tests__/lists-test.ts

@@ -38,7 +38,7 @@ describe('Execute: Accepts any iterable as list value', () => {
     });
   });
 
-  it('Accepts an Generator function as a List value', () => {
+  it('Accepts a Generator function as a List value', () => {
     function* listField() {
       yield 'one';
       yield 2;

src/language/__tests__/printLocation-test.ts

@@ -61,7 +61,7 @@ describe('printSourceLocation', () => {
     `);
   });
 
-  it('prints an line numbers with correct padding', () => {
+  it('prints line numbers with correct padding', () => {
     const result = printSourceLocation(
       new Source('*\n', 'Test', { line: 9, column: 1 }),
       { line: 1, column: 1 },

src/type/__tests__/definition-test.ts

@@ -616,7 +616,7 @@ describe('Type System: List', () => {
     return expect(() => new GraphQLList(type));
   }
 
-  it('accepts an type as item type of list', () => {
+  it('accepts a type as item type of list', () => {
     expectList(ScalarType).to.not.throw();
     expectList(ObjectType).to.not.throw();
     expectList(UnionType).to.not.throw();
@@ -633,7 +633,7 @@ describe('Type System: Non-Null', () => {
     return expect(() => new GraphQLNonNull(type));
   }
 
-  it('accepts an type as nullable type of non-null', () => {
+  it('accepts a type as nullable type of non-null', () => {
     expectNonNull(ScalarType).to.not.throw();
     expectNonNull(ObjectType).to.not.throw();
     expectNonNull(UnionType).to.not.throw();

src/utilities/__tests__/buildClientSchema-test.ts

@@ -306,7 +306,7 @@ describe('Type System: build schema from introspection', () => {
 
         """A field with a two args"""
         two(
-          """This is an list of int arg"""
+          """This is a list of int arg"""
           listArg: [Int]
 
           """This is a required arg"""

src/utilities/__tests__/printSchema-test.ts

@@ -613,7 +613,7 @@ describe('Type System Printer', () => {
     `);
   });
 
-  it('Prints an description with only whitespace', () => {
+  it('Prints a description with only whitespace', () => {
     const schema = buildSingleFieldSchema({
       type: GraphQLString,
       description: ' ',