[Content templates] update inconsistencies in contribution content templates ☔

[laurenmrice]

Acceptance criteria

While the design team has been working on our issues of improving our website documentation, several of us have noticed some inconsistencies in the content templates we are referring to and we need to update the markdown templates for them on the website so they are accurate.

• Update inconsistencies in the content templates in the markdown examples on the website.
• This is a running list of some things we need to adjust in the templates, please add any other changes if there are any to these issues below.

Tasks

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1. [Content templates] Usage template: for components with one variant #3982
   role: design ✏️ type: docs 📖 +2
   
2. [Content templates] Usage template: for components with multiple variants #3983
   role: design ✏️ type: docs 📖 +2
3. [Content templates] Usage template: Add new optional sections #4178
   0 of 4
   role: design ✏️ type: docs 📖 type: enhancement 💡 +3
4. [Content templates] Style template: for components with multiple variants #4180
   content: copy ✍️ role: design ✏️ +2
   
5. [Content templates] Accessibility template #3984
   role: design ✏️ type: docs 📖 +2

[sstrubberg]

This is even more important with having new team members getting used to how our documentation standards work. AND our contributors from product teams.