docs: Update job scheduling using cron (#399)

* updated the cron with 7 field

* added cron examples in properties section

Author: nayanj98

docs/understanding/terminologies/olake.mdx

@@ -209,20 +209,44 @@ User has to start with job creation, which will be followed with source configur
   - Default options i.e every minute, hourly, daily, weekly
   - Custom frequency: Specify a cron expression.
 
-**Guide to Cron Expression:**
+OLake supports **Custom Frequency** using cron expressions in both 5-field and 7-field formats:
+
+- **5-field:** `minute, hour, day_of_month, month, day_of_week`
+- **7-field:** `second, minute, hour, day_of_month, month, day_of_week, year`
+
+:::note
+OLake does **not** support Quartz cron syntax.
+:::
+
+**Guide to Cron Expression (5-field format):**
 
 | * | * | * | * | * |
 |---|---|---|---|---|
 | minute (0-59) | hour (0-23) | day of the month (1-31) | month (1-12) | day of the week (0-6) |
 
 
-**Cron Examples:**
+**Cron Examples (5-field format):**
 - `* * * * *` = Every minute
 - `0 * * * *` = Every hour
 - `0 0 * * *` = Every day at 12:00 AM
 - `0 0 * * FRI` = At midnight only on Fridays
 - `0 0 1 * *` = At midnight on the 1st day of each month
 
+**Guide to Cron Expression (7-field format):**
+
+| * | * | * | * | * | * | * |
+|---|---|---|---|---|---|---|
+| second (0-59) | minute (0-59) | hour (0-23) | day of the month (1-31) | month (1-12) | day of the week (0-6) | year |
+
+**Cron Examples (7-field format):**
+- `* * * * * * *` = Every second
+- `0 * * * * * *` = Every minute
+- `0 0 * * * * *` = Every hour
+- `0 0 0 * * * *` = Every day (day_of_month)
+- `0 0 0 1 * * *` = Every month (on day 1)
+- `0 0 0 * * 5 *` = Every week (on Friday)
+- `0 0 0 1 1 * *` = Every year (on January 1)
+
 <div style={{ textAlign: "center" }}>
   <img src="/img/docs/terminologies/job-config.webp" 
        alt="Olake Partition output"