Replaces 'certify' with 'validate' for Fuel Plugins
Replaces 'certify' with 'validate' for Fuel Plugins

Change-Id: I598a97d54dbd05b7237d31aecb08c9b3e88ea337

stackforge/fuel-docs,ogelbukh/fuel-docs,ogelbukh/fuel-docs,ogelbukh/fuel-docs,stackforge/fuel-docs,ogelbukh/fuel-docs