chore(repo): update angular path (#28426)

Issue number: #

---------

<!-- Please do not submit updates to dependencies unless it fixes an
issue. -->

<!-- Please try to limit your pull request to one type (bugfix, feature,
etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->
i found a small typo in the contributing guide

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

update the relative path for updating ionic angular, now that it's code
lives under the `packages/` directory

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

Author: rwaskiewicz

.github/CONTRIBUTING.md

@@ -163,7 +163,7 @@ npm i
 npm run build
 npm pack --pack-destination ~
 
-cd ../angular
+cd ../packages/angular
 npm i
 npm run sync
 npm run build