Update index.md

[Francois-dev]

Add clarification about Org2org using SAML - not to be used in this case, Org2org must be OIDC. Simple and better explanation.

Description:

• What's changed? Only 2 lines, to remind to use OIDC org2org
• Is this PR related to a Monolith release? No

[acrolinxdevdocs-okta]

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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
:white_check_mark: packages/@okta/vuepress-site/docs/guides/configure-amr-claims-mapping/main/index.md	79	22	93	84	100

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[brianduffield-okta]

@Francois-dev Many thanks for opening the PR. I'll forward to our engineering for review and merge.