Correct spelling and address minor Markdown lint issues in three issue templates

Ed Torresrequested to merge
gitlab-community/gitlab-org/gitlab:issue-templates-cleanup into master

What does this MR do and why?

This MR makes spelling corrections and minor Markdown lint fixes in the following files:

.gitlab/issue_templates/Code Suggestions Model Rollout Plan.md
.gitlab/issue_templates/Empty state.md
.gitlab/issue_templates/Plan - Spike.md

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