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

Issue number: #

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## What is the current behavior?
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i found a small typo in the contributing guide

## What is the new behavior?
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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

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and migration path for existing applications below. -->


## Other information

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.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