Fix reference to dcp in loading example

[angerrp]

Description

Imported as DCP but used as dcp. Changed import to dcp to have same import style as saving example.

Checklist

• [x] The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• [x] Only one issue is addressed in this pull request
• [x] Labels from the issue that this PR is fixing are added to this pull request
• [x] No unnecessary issues are included into this pull request.

cc @wconstab @osalpekar @H-Huang @kwen2501