[SPARK-52466] Clean up unnecessary comments in e2e tests

### What changes were proposed in this pull request?

This PR aims to clean up unnecessary comments in `e2e` tests.

### Why are the changes needed?

**BEFORE**

```
$ git grep '  #' tests | wc -l
       2
```

**AFTER**

```
$ git grep '  #' tests | wc -l
       0
```

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Pass the CIs.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes apache#240 from dongjoon-hyun/SPARK-52466.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: dongjoon-hyun

tests/e2e/python/pyspark-example.yaml

@@ -25,7 +25,6 @@ spec:
   pyFiles: "local:///opt/spark/examples/src/main/python/streaming/network_wordcount.py"
   sparkConf:
     spark.executor.instances: "1"
-    # see also https://hub.docker.com/_/spark
     spark.kubernetes.container.image: ($IMAGE)
     spark.kubernetes.authenticate.driver.serviceAccountName: "spark"
   runtimeVersions:

tests/e2e/spark-versions/spark-example.yaml

@@ -26,7 +26,6 @@ spec:
   jars: ($JARS)
   sparkConf:
     spark.executor.instances: "1"
-    # see also https://hub.docker.com/_/spark
     spark.kubernetes.container.image: ($IMAGE)
     spark.kubernetes.authenticate.driver.serviceAccountName: "spark"
   runtimeVersions: