fix(core): update migration descriptions with links to AIO documentation

[clydin]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

9.0 migrations did not contain references to the AIO documentation describing the migrations.

What is the new behavior?

9.0 migrations that have accompanying documentation now have links to the aforementioned documentation. The versions for the migration schematics were also corrected to use a valid semver version.

Does this PR introduce a breaking change?

• No

Other information

[kara]

LGTM, thanks for updating!

[devversion]

@clydin The version's in the migration collection were actually valid in terms of ng update. See: https://github.com/angular/angular-cli/blob/master/packages/schematics/update/migrate/index.ts#L76.

Though I agree that it's s good to make them semver compliant anyway (even though it doesn't change anything in terms of the migration). Are there plans to remove this version coercion from the CLI?

[clydin]

It is indeed valid for ng update's version of a version. However, any other tool that happens to use the files should ideally not be required to implement ng update's non-standard semantics. However, with such versions already in the field, the CLI will need to maintain support for these versions and the code to parse them for the foreseeable future.

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