Update SSO configuration instructions

[LordSimal]

Added note about redirect URL and installation script.

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It was not clear from the get go what redirect URL should be used when using Google SSO. This adds a separate sentence to clarify it.

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[sentry]

Bug: The navigation path Organization Settings => Organization => Auth is incorrect. The correct path to Sentry's Auth settings is Org Settings > Auth.
_{Severity: LOW}

Suggested Fix

Update the navigation path in sso.mdx to Org Settings > Auth to match the actual UI and other documentation. The URL can also be provided for clarity: /settings/ORG_SLUG/auth/.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: develop-docs/self-hosted/configuration/sso.mdx#L42

Potential issue: The documentation provides an incorrect navigation path for accessing
SSO settings: `Organization Settings => Organization => Auth`. The intermediate `=>
Organization =>` step does not exist in the Sentry UI. The correct path is `Org Settings
> Auth`, as confirmed by other documentation files. This error will prevent users from
finding the authentication settings page, hindering their ability to configure SSO.

_{Did we get this right? 👍 / 👎 to inform future reviews.}