Clarify 'nothing to be done' message

[StephenFluin]

Versions

Angular CLI: 6.0.0-rc.2
Node: 9.2.0
OS: linux x64
Angular: 6.0.0-rc.3
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

@angular/cli: 6.0.0-rc.2
@angular-devkit/architect: 0.5.4
@ngtools/json-schema: 1.2.0
@schematics/update: 0.5.4
typescript: 2.9.0-dev.20180409
webpack: error

Repro steps

Run ng update when there is a package listed that needs to be updated

Observed behavior

$ ng update
    We analyzed your package.json, there are some packages to update:
    
      Name                               Version                    Command to update
     ---------------------------------------------------------------------------------------------------------
      @types/node                        6.0.104 -> 9.6.2           npm install @types/node
      jasmine-core                       2.8.0 -> 3.1.0             npm install jasmine-core
      karma-jasmine-html-reporter        0.2.2 -> 1.0.0             npm install karma-jasmine-html-reporter
      protractor                         5.1.2 -> 5.3.1             npm install protractor
      ts-node                            4.1.0 -> 5.0.1             npm install ts-node
    
    
    There might be additional packages that are outdated.
    Or run ng update --all to try to update all at the same time.
    
Nothing to be done.

Desired behavior

The 'Nothing to be done.' message is confusing.

I recommend either removing it entirely, or changing it to something like 'By default no updates are run automatically, run one of the commands above to start updating'.

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