docs(serverless_jobs): add documentation for command, timezone and schedule fields (scaleway#2044)

Co-authored-by: Mia-Cross <lmarabese@scaleway.com>

Author: scaleway-bot

api/jobs/v1alpha1/jobs_sdk.go

@@ -137,8 +137,10 @@ func (enum *ListJobRunsRequestOrderBy) UnmarshalJSON(data []byte) error {
 
 // CronSchedule: cron schedule.
 type CronSchedule struct {
+// Schedule: uNIX cron schedule to run job (e.g., '* * * * *').
 Schedule string `json:"schedule"`
 
+// Timezone: timezone for the cron schedule, in tz database format (e.g., 'Europe/Paris').
 Timezone string `json:"timezone"`
 }
 
@@ -247,7 +249,7 @@ type CreateJobDefinitionRequest struct {
 // ImageURI: image to use for the job.
 ImageURI string `json:"image_uri"`
 
-// Command: startup command.
+// Command: startup command. If empty or not defined, the image's default command is used.
 Command string `json:"command"`
 
 // ProjectID: UUID of the Scaleway Project containing the job.