Merge pull request ClickHouse#79834 from ClickHouse/Blargian-patch-16

Docs: Update `Null` format with an example

Author: bharatnc

docs/en/interfaces/formats/Null.md

@@ -2,7 +2,7 @@
 alias: []
 description: 'Documentation for the Null format'
 input_format: false
-keywords: ['Null']
+keywords: ['Null', 'format']
 output_format: true
 slug: /interfaces/formats/Null
 title: 'Null'
@@ -24,4 +24,26 @@ The `Null` format can be useful for performance testing.
 
 ## Example Usage {#example-usage}
 
-## Format Settings {#format-settings}
+Connect to `play.clickhouse.com` with clickhouse client:
+
+```bash
+clickhouse client --secure --host play.clickhouse.com --user explorer
+```
+
+Run the following the query:
+
+```sql title="Query"
+SELECT town
+FROM uk_price_paid
+LIMIT 1000
+FORMAT `Null`
+```
+
+```response title="Response"
+0 rows in set. Elapsed: 0.002 sec. Processed 1.00 thousand rows, 2.00 KB (506.97 thousand rows/s., 1.01 MB/s.)
+Peak memory usage: 297.74 KiB.
+```
+
+Note how 1000 rows were processed, but 0 rows were output in the result set.
+
+## Format Settings {#format-settings}