Update metrics docs to reflect changes in new version of ASR snippets
Update metrics docs to reflect changes in new version of ASR snippets

glogiotatidis/snippets-service,mozilla/snippets-service,mozilla/snippets-service,mozmar/snippets-service,mozmar/snippets-service,glogiotatidis/snippets-service,mozmar/snippets-service,glogiotatidis/snippets-service,mozmar/snippets-service,mozilla/snippets-service,mozilla/snippets-service,glogiotatidis/snippets-service