[GUIDES]: Fix ActiveStorage::FixtureSet.blob YAML
[GUIDES]: Fix ActiveStorage::FixtureSet.blob YAML

Resolves incorrect fixture guide YAML paths, and compacts the
`FixtureSet.blob` call to a single line to resolve syntax highlighting
quirks.

BlakeWilliams/rails,MSP-Greg/rails,kmcphillips/rails,georgeclaghorn/rails,yahonda/rails,esparta/rails,Edouard-chin/rails,Edouard-chin/rails,kddeisz/rails,rails/rails,rails/rails,Envek/rails,Stellenticket/rails,Stellenticket/rails,Erol/rails,MSP-Greg/rails,esparta/rails,kmcphillips/rails,Edouard-chin/rails,yawboakye/rails,yawboakye/rails,esparta/rails,yawboakye/rails,Edouard-chin/rails,Vasfed/rails,Envek/rails,lcreid/rails,kmcphillips/rails,kddeisz/rails,kddeisz/rails,rails/rails,MSP-Greg/rails,Stellenticket/rails,yahonda/rails,Vasfed/rails,BlakeWilliams/rails,kmcphillips/rails,georgeclaghorn/rails,Envek/rails,rails/rails,lcreid/rails,georgeclaghorn/rails,Erol/rails,kddeisz/rails,Erol/rails,BlakeWilliams/rails,Stellenticket/rails,yawboakye/rails,Envek/rails,lcreid/rails,yahonda/rails,lcreid/rails,georgeclaghorn/rails,Vasfed/rails,Vasfed/rails,esparta/rails,MSP-Greg/rails,Erol/rails,yahonda/rails,BlakeWilliams/rails