docs(product): Update stale image and descriptions on N+1 Queries Issue page

[inventarSarah]

DESCRIBE YOUR PR

See: https://sentry-docs-git-smi-chorestale-image-18205.sentry.dev/product/issues/issue-details/performance-issues/n-one-queries/

• updates 2 stale screenshots (settings, span evidence)
• updates span evidence description
• removes 2 screenshots from the "Example" section (These screenshots were made specifically for the example described, and in order to recreate them, we would have to recreate the whole example)
• updates descriptions in the "Example" section

Closes: #18205

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