Incorrect ng generate library option description in wiki.

[tplk]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [x] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Repro steps

https://github.com/angular/angular-cli/wiki/generate-library

Desired functionality

skip-install description is incorrect:

Do not add dependencies to package.json.

Should be:

Skip installing dependency packages.

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