[DOCS] Adds missing security anchors (elastic#47585)

Author: lcawl

x-pack/docs/en/security/authentication/oidc-guide.asciidoc

@@ -557,7 +557,7 @@ OP or a third party (see <<third-party-login>>, we need to explicitly _whitelist
 OpenID Connect authentication endpoint within {kib}, so that the {kib} server will
 not reject these external messages.
 
-
+[[oidc-without-kibana]]
 === OpenID Connect without {kib}
 
 The OpenID Connect realm is designed to allow users to authenticate to {kib} and as

x-pack/docs/en/security/authentication/saml-guide.asciidoc

@@ -863,6 +863,7 @@ It is possible to have one or more {kib} instances that use SAML, while other
 instances use basic authentication against another realm type (e.g.
 <<native-realm, Native>> or <<ldap-realm, LDAP>>).
 
+[[saml-troubleshooting]]
 === Troubleshooting SAML Realm Configuration
 
 The SAML 2.0 specification offers a lot of options and flexibility for the implementers