doc(plugin): notes for --link when the linking is lost

[GitToTheHub]

• Added notice, that the linking only works, when the plugin is added after a platform was added and that the linking will be lost if a platform is re-added or a project is restored
• Added link to "Version management" to explain what restoring a project means and add cordova prepare to give an example also

Platforms affected

All

Motivation and Context

It was not clear, that the plugin linking will be lost, if a platform is re-added or a project is restored

Description

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[erisu]

Can this also be added to the dev docs?

https://github.com/apache/cordova-docs/blob/master/www/docs/en/dev/guide/hybrid/plugins/index.md

[GitToTheHub]

Sure no problem, I will add it 🙂

[GitToTheHub]

I added it but had some problems with git. Should I reopen this pr with one commit?

[erisu]

It is OK if there is multiple commits in the PR. When we merge the PR, we use the "Squash and merge" option to make a single commit.

[GitToTheHub]

Oh ok I have to learn some things still :) I know this option, but was not using it very often. Thanks.