update Mozilla root CA certs link to official site

Author: shikokuchuo

R/nanonext-package.R

@@ -28,7 +28,7 @@
 #'
 #' @section Usage notes:
 #'
-#'     \code{nanonext} offers 2 equivalent interfaces: a functional interface,
+#'     \pkg{nanonext} offers 2 equivalent interfaces: a functional interface,
 #'     and an object-oriented interface.
 #'
 #'     The primary object in the functional interface is the Socket. Use

R/tls.R

@@ -59,10 +59,13 @@
 #'     an empty client configuration is created), as a configuration can only be
 #'     of one type.
 #'
-#'     For creating client configurations for public internet usage, up-to-date
-#'     CA certificates in PEM format, extracted from Mozilla, are available at:
-#'     \url{https://curl.se/docs/caextract.html}. This link is not endorsed; use
-#'     at your own risk.
+#'     For creating client configurations for public internet usage, root CA
+#'     ceritficates can usually be found at
+#'     \file{/etc/ssl/certs/ca-certificates.crt} on Linux systems. Otherwise,
+#'     root CA certificates in PEM format are available at the Common CA
+#'     Database site run by Mozilla: \url{https://www.ccadb.org/resources}
+#'     (select the Server Authentication SSL/TLS certificates text file).
+#'     \emph{This link is not endorsed; use at your own risk.}
 #'
 #' @examples
 #' tls <- tls_config()