[DOC] Format the code snippets in the SDK docs in the same manner

[YuriyVelichkoPI]

It is a follow-up ticket to review and format the code snippets in the SDK docs in the same manner for both platforms and on all pages.

Details:

• https://github.com/prebid/prebid.github.io/pull/5507#discussion_r1757365402
• https://github.com/prebid/prebid.github.io/pull/5507#discussion_r1751723742
• https://github.com/prebid/prebid.github.io/pull/5507#discussion_r1753748940