update docs on cache contents

Signed-off-by: Hans Zandbelt <[email protected]>

auth_openidc.conf

@@ -622,12 +622,16 @@
 ########################################################################################
 
 # Cache type, used for temporary storage that is shared across Apache processes/servers for:
-#  a) session state
-#  b) nonce values to prevent replay attacks
-#  c) validated OAuth 2.0 tokens
-#  d) JWK sets that have been retrieved from jwk_uri's
-#  e) resolved OP metadata when using OIDCProviderMetadataUrl
-#  f) temporary state associated with Request URI's
+#  - authenticated user session state
+#  - nonce values from authorization requests (to prevent replay attacks)
+#  - validated OAuth 2.0 access tokens
+#  - refresh tokens during their usage in a refresh token request i.e. refreshing an access token and possible the refresh token itself
+#  - JWK sets that have been retrieved from jwk_uri's (to validate id_token, logout_token, JWT access_token and JWT userinfo response)
+#  - resolved OP metadata when using OIDCProviderMetadataUrl and/or OIDCOAuthServerMetadataURL
+#  - jti values from logout_token when receiving Backchannel Logout requests
+#  - temporary state associated with Request URI's
+#  - signed JWTs when using OIDCPassUserInfoAs signed_jwt and environment variable OIDC_USERINFO_SIGNED_JWT_CACHE_TTL
+#  -  JQ filter results when using OIDCFilterClaimsExpr and/or OIDCUserInfoClaimsExpr and/or Require claims_expr
 # must be one of \"shm\", \"memcache\", \"file\" or, if Redis support is compiled in, \"redis\" 
 # When not defined, "shm" (shared memory) is used.
 #OIDCCacheType [shm|memcache|file[|redis]]