Updating help message for exec task so it will render properly

[jwoertink]

Purpose

Fixes #2009

Description

The LuckyTask help message format was updated a while back but this task was missed.

Checklist

• - An issue already exists detailing the issue/or feature request that this PR fixes
• - All specs are formatted with crystal tool format spec src
• - Inline documentation has been added and/or updated
• - Lucky builds on docker with ./script/setup
• - All builds and specs pass on docker with ./script/test