Correct the name of the button(s)

[sinsukehlab]

Is your feature request related to a problem? Please describe.
The instruction for ⌨️ Activity: Suggest changes says, "After the commment form appears, click the Insert a suggestion button," but I found an Add a suggestion button instead of an Insert a suggestion one. Also, the button described on the last line actually says "Add single comment".

Describe the solution you'd like
The instruction should be modified so that it can mean the correct buttons.

• Insert a suggestion → Add a suggestion
• (Add a single comment → Add single comment)

Describe alternatives you've considered
The Add single comment button should be changed into an Add a single comment one.

Additional context
The instructions for the Activity is as follows:

1. On the pull request, click Files changed.
2. Find the index.html changes.
3. Hover your cursor next to the line numbers on the left side of the page.
4. Click the blue plus icon.
5. After the commment form appears, click the Insert a suggestion button.
6. Edit the suggestion.
7. Click Add a single comment.

[sinsukehlab]

This discussion might be related to my issue.

Discussed in https://github.com/orgs/skills/discussions/9

^{Originally posted by BecAndCall June 15, 2022}
Hello, Skills team.

Everything went pretty smoothly, overall, but I did not see the "Insert a suggestion button" in Step 3. This may be why I did not see the "Commit suggestion" option in Step 4.

Can anyone screen shot or advise what I missed? I'd appreciate it. I'll walk through again until I get this right. 👍

Cheers, Bec