[MINOR][BUILD] Remove todos for testing in the real releases

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

This PR proposes to remove todos (that are tested).

### Why are the changes needed?

To note what's tested or not for developement.

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

No, dev-only.

### How was this patch tested?

Manually tested.

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

No.

Closes apache#52207 from HyukjinKwon/remove-what-is-tested.

Authored-by: Hyukjin Kwon <[email protected]>
Signed-off-by: Hyukjin Kwon <[email protected]>

Author: HyukjinKwon

dev/create-release/release-build.sh

@@ -162,7 +162,6 @@ if [[ "$1" == "finalize" ]]; then
   echo "Uploading release docs to spark-website"
   cd spark-website
 
-  # TODO: Test it in the actual release
   # 1. Add download link to documentation.md
   python3 <<EOF
 import re
@@ -545,7 +544,6 @@ EOF
 
   echo "Done."
 
-  # TODO: Test it in the actual official release
   # Remove old releases from the mirror
   # Extract major.minor prefix
   RELEASE_SERIES=$(echo "$RELEASE_VERSION" | cut -d. -f1-2)