updates to doc for OCI journey

[susanharper-okta]

Description:

• What's changed? updates to doc for OCI journey
• Is this PR related to a Monolith release? no

Resolves:

OKTA-1211629

[okta-prod-github-app]

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Article	Total score Required:80	Word and phrases (Brand, terms) Preferred: 80	Correctness (Spelling, grammar) Preferred: 80	Clarity (Readability) Preferred: 80	Inclusive language (+ accesibility) Preferred: 80
✅ packages/@okta/vuepress-site/docs/guides/oie-upgrade-sign-in-widget/main/index.md	87	96	79	92

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[brentschaus-okta]

LGTM!