remove redundant example from oc projects

[juanvallejo]

Related BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1351979
Removes unneeded example from oc projects usage text.

Before

$ oc projects -h

Display information about the current active project and existing projects on the server.

For advanced configuration, or to manage the contents of your config file, use the 'config'
command.

Usage:
  oc projects [options]

Examples:
  # Display the projects that currently exist
  oc

Options:
  -q, --short=false: If true, display only the project names

Use "oc options" for a list of global command-line options (applies to all commands).

After

$ oc projects -h

Display information about the current active project and existing projects on the server.

For advanced configuration, or to manage the contents of your config file, use the 'config'
command.

Usage:
  oc projects [options]
Options:
  -q, --short=false: If true, display only the project names

Use "oc options" for a list of global command-line options (applies to all commands).

cc @fabianofranz

[juanvallejo]

[test]

[openshift-bot]

Evaluated for origin test up to 55a0a2f

[fabianofranz]

LGTM [merge]

[openshift-bot]

continuous-integration/openshift-jenkins/merge SUCCESS (https://ci.openshift.redhat.com/jenkins/job/test_pr_origin/7748/) (Image: devenv-rhel7_4801)

[openshift-bot]

Evaluated for origin merge up to 55a0a2f

[openshift-bot]

continuous-integration/openshift-jenkins/test SUCCESS (https://ci.openshift.redhat.com/jenkins/job/test_pr_origin/7748/)