website/docs: add credentials prompt for rac doc (#14840)

* Adds document

* Typo

* Clarified RAC endpoint sentence based on Tana's suggestion.

* Update website/docs/add-secure-apps/providers/rac/rac_credentials_prompt.md

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Dewi Roberts <dewi@goauthentik.io>

* Small wording improvements

* Added connection security type information

* A word

* Added to sidebar

* Update website/docs/add-secure-apps/providers/rac/rac_credentials_prompt.md

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Dewi Roberts <dewi@goauthentik.io>

* Applied suggestions from Tana

* Update website/docs/add-secure-apps/providers/rac/rac_credentials_prompt.md

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Dewi Roberts <dewi@goauthentik.io>

---------

Signed-off-by: Dewi Roberts <dewi@goauthentik.io>
Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>

website/sidebars/docs.mjs

@@ -241,6 +241,7 @@ const items = [
                         items: [
                             "add-secure-apps/providers/rac/how-to-rac",
                             "add-secure-apps/providers/rac/rac-public-key",
+                            "add-secure-apps/providers/rac/rac_credentials_prompt",
                         ],
                     },
                     "add-secure-apps/providers/radius/index",