Write copy explaining "brief overview" question on Wins form

### Overview

Based on the Wins submission research findings, users are confused about what is expected in the "brief overview" question on p.4 of the Win submission form. Users would like word count suggestions, and additional guidelines on what we want them to write.

### Action Items

- [ ] Review research presentation: https://docs.google.com/presentation/d/1RU80s0ep8azGb7V3IUQ3N-8dDmzQH7oV1nn8q_peTUY/edit#slide=id.p

User quote:
“Not sure what this one is exactly asking for, a brief overview of what? I think that would be better if they gives me more specific guideline.”

- [ ] Review analysis board: https://drive.google.com/drive/u/0/folders/1DQMLMmorazeKM3b1W-eZQZAV0GcIbRF2

- [ ] Write a short copy that would provide guidance on what is expected in the “brief overview” question (p.4 of form). Include word count. Since there is already a long checklist of potential wins to celebrate, the explanation could be along the lines of "tell us more about the Win you selected, etc." The copy would be placed in the description right under the question:

### Resources/Instructions

Wins submission research Wiki: https://github.com/hackforla/website/wiki/Wins-submission-process-research

### Is there a dependency?

Yes

### If Yes, please explain

Development to include the new copy.