Add spark-messages, and fix descriptions per guidelines

[brh55]

Added spark-messages to Tools, but fixed a few descriptions to abide by the gool ol' guidelines.

✅  I have added my resource in alphabetical order
✅  I know that this resource was not listed before
✅  I have added a link to the source code repo (except for documentation, articles etc.)
✅  I have checked my resource is properly documented
✅  I have added a synthetic description of my resource
✅  I have read the Contribution guidelines and Quality standard.

[ObjectIsAdvantag]

Thanks for the contribution Brandon +1 for the formatting feedback

[brh55]

Thanks Steve 💃 !