fix(srv): fix indent in cron reference (#5333)

Author: SamyOubouaziz

macros/serverless/cron-schedules.mdx

@@ -9,15 +9,15 @@ Adding a cron schedule to a specific task allows you to run it automatically at
 Cron jobs are expressed using the `* * * * *` format, which corresponds to the fields below.
 
 ```
-  ┌───────────── minute
-  │ ┌───────────── hour
-  │ │ ┌───────────── day of the month
-  │ │ │ ┌───────────── month
-  │ │ │ │ ┌───────────── day of the week
-  │ │ │ │ │
-  │ │ │ │ │
-  │ │ │ │ │
-  * * * * *
+┌───────────── minute
+│ ┌───────────── hour
+│ │ ┌───────────── day of the month
+│ │ │ ┌───────────── month
+│ │ │ │ ┌───────────── day of the week
+│ │ │ │ │
+│ │ │ │ │
+│ │ │ │ │
+* * * * *
 ```
 
 Each field supports a specific range of values.