docs(plugin): fix typo with inline plugin example.
docs(plugin): fix typo with inline plugin example.

ernsheong/karma,SamuelMarks/karma,kahwee/karma,panrafal/karma,skycocker/karma,johnjbarton/karma,wesleycho/karma,ernsheong/karma,johnjbarton/karma,johnjbarton/karma,kahwee/karma,Dignifiedquire/karma,panrafal/karma,mprobst/karma,pedrotcaraujo/karma,mprobst/karma,kahwee/karma,david-garcia-nete/karma,maksimr/karma,skycocker/karma,shirish87/karma,marthinus-engelbrecht/karma,wesleycho/karma,marthinus-engelbrecht/karma,pedrotcaraujo/karma,david-garcia-nete/karma,SamuelMarks/karma,Dignifiedquire/karma,SamuelMarks/karma,skycocker/karma,Dignifiedquire/karma,buley/karma,maksimr/karma,karma-runner/karma,shirish87/karma,maksimr/karma,wesleycho/karma,mprobst/karma,karma-runner/karma,buley/karma,Dignifiedquire/karma,skycocker/karma,shirish87/karma,pedrotcaraujo/karma,panrafal/karma,marthinus-engelbrecht/karma,buley/karma,karma-runner/karma,pedrotcaraujo/karma,karma-runner/karma,buley/karma,kahwee/karma,ernsheong/karma,johnjbarton/karma,marthinus-engelbrecht/karma,wesleycho/karma,david-garcia-nete/karma