Instructions to update angular cli from 5 to 6 are incorrect

[RohanHart]

📚 Docs or angular.io bug report

Description

The update documentation for 5->6 is incorrect. The step ng update @angular/cli@6 does not migrate and displays Invalid rule result: null. The correct instruction should be ng update @angular/cli --migrate-only --from=1.7.4.

The issue is that the logic which determines which package to migrate does not strip off the version requested.

🔬 Minimal Reproduction

What's the affected URL?**

https://update.angular.io/#5.0:6.0

Reproduction Steps**

1. Create a new angular 5 project
2. Try to update it to 6 using the instructions from https://update.angular.io

🌍 Your Environment

Browser info

Anything else relevant?

npm 6.11.3

[mgechev]

@RohanHart thanks for reporting the issue! Looks like this is already under the radar in the update guide angular/angular-update-guide#64.

Feel free to add further details if there's anything missing.

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