Docs(deploying-with-docker.mdx): Inform user about `turbo prune` command (#7948)
### Description
The command `turbo prune web --docker` produces an error if the name in
the package.json is not set to web, for example:
```
{
name: "next-app",
private: true,
...
}
```
It will then throw the error: `package web not found`. This change
informs the user that it is being assumed that the name given in the
package.json is "web".
### Testing Instructions
1. Create a nextjs project with a name other than `web`, `next-app` for
example.
2. Copy the Dockerfile for the nextjs app [found
here](https://turbo.build/repo/docs/handbook/deploying-with-docker) in
the deploying with docker handbook
3. Run the command `docker-compose up`
4. Expect an Error stating `package web not found`
5. Change the line `RUN turbo prune web --docker` to `RUN turbo prune
next-app --docker`
6. Run the command `docker-compose up`
7. It should run successfully
Co-authored-by: Anthony Shew <anthony.shew@vercel.com>
turbo
f1487595 - Docs(deploying-with-docker.mdx): Inform user about `turbo prune` command (#7948)
