Fix coerceInputValue test name (#3681)

* Fix coerceInputValue test name

* fix grammar

Author: spawnia

src/utilities/__tests__/coerceInputValue-test.ts

@@ -118,7 +118,7 @@ describe('coerceInputValue', () => {
       ]);
     });
 
-    it('returns an error for undefined result', () => {
+    it('returns a thrown error', () => {
       const inputValue = { error: 'Some error message' };
       const result = coerceValue(inputValue, TestScalar);
       expectErrors(result).to.deep.equal([

src/utilities/coerceInputValue.ts

@@ -148,7 +148,7 @@ function coerceInputValueImpl(
   if (isLeafType(type)) {
     let parseResult;
 
-    // Scalars and Enums determine if a input value is valid via parseValue(),
+    // Scalars and Enums determine if an input value is valid via parseValue(),
     // which can throw to indicate failure. If it throws, maintain a reference
     // to the original error.
     try {