Issue description

The following sentence in the documentation seems incorrect:

If you already have a Serverless service, and would prefer to lock down the framework version using package.json, then you can install Serverless as follows:

As discussed in #13309 and other related issues, this does not actually lock the framework version.

It would be better to remove this sentence to avoid misunderstanding. Alternatively, the documentation should clarify that this does not lock the framework version or prevent automatic updates.

Context

No response