Properly link to keyring package documentation

Change-Id: Icd5e415ed2e69b3d11fcad209110dede3da1b2d9
diff --git a/R/KorAPConnection.R b/R/KorAPConnection.R
index ecfc52d..6739aee 100644
--- a/R/KorAPConnection.R
+++ b/R/KorAPConnection.R
@@ -53,7 +53,7 @@
 #'   ```
 #'
 #'   This will store it in your keyring using the
-#'   [keyring] package. Subsequent new("KorAPConnection") calls will
+#'   [keyring::keyring-package]. Subsequent new("KorAPConnection") calls will
 #'   then automatically retrieve the token from your keying. To stop using a
 #'   persisted token, call `clearAccessToken(kco)`. Please note that for
 #'   DeReKo, authorized queries will behave differently inside and outside the