docs(cli): typos in flagname, make test description accurate

packages/aws-cdk/lib/cdk-toolkit.ts

@@ -183,7 +183,7 @@ export class CdkToolkit {
         let changeSet = undefined;
 
         if (options.changeSet) {
-          // only perform this check if we're going to make a changeset. This check requires permissions that --no-changeset users might not have.
+          // only perform this check if we're going to make a changeset. This check requires permissions that --no-change-set users might not have.
           const stackExists = await this.props.deployments.stackExists({
             stack: stack,
             deployName: stack.stackName,

packages/aws-cdk/test/diff.test.ts

@@ -336,7 +336,7 @@ describe('non-nested stacks', () => {
     expect(exitCode).toBe(0);
   });
 
-  test('diff does not check for stack existence when --no-changeset is passed', async () => {
+  test('diff does not check for stack existence when changeSet is false', async () => {
     // GIVEN
     const buffer = new StringWritable();