chore(docs): add missing word / fix typo (#19849)

----

### All Submissions:

* [X] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: ZackKanter

packages/@aws-cdk/pipelines/README.md

@@ -149,7 +149,7 @@ application stages in the source code, or new stacks to `MyApplication`, the
 pipeline will automatically reconfigure itself to deploy those new stages and
 stacks.
 
-(Note that have to *bootstrap* all environments before the above code
+(Note that you have to *bootstrap* all environments before the above code
 will work, and switch on "Modern synthesis" if you are using
 CDKv1. See the section **CDK Environment Bootstrapping** below for
 more information).