config.md: Correct formatting of config values
config.md: Correct formatting of config values

Change-Id: I901be6870c9f995f01711a0ba613f1c95f486721

GerritCodeReview/plugins_delete-project,GerritCodeReview/plugins_delete-project,GerritCodeReview/plugins_delete-project,GerritCodeReview/plugins_delete-project