acinclude.m4: Document proper system truststore on FreeBSD

The default system truststore on FreeBSD has been /etc/ssl/certs for many
years now. It is managed canonically through certctl(8) and contains hashed
symlinks for OpenSSL and other TLS providers.
The previous ones require security/ca_root_nss which might not be installed or
will not contain any custom CA certificates.

Closes #11985

acinclude.m4

@@ -1446,9 +1446,9 @@ dnl regarding the paths this will scan:
 dnl /etc/ssl/certs/ca-certificates.crt Debian systems
 dnl /etc/pki/tls/certs/ca-bundle.crt Redhat and Mandriva
 dnl /usr/share/ssl/certs/ca-bundle.crt old(er) Redhat
-dnl /usr/local/share/certs/ca-root-nss.crt FreeBSD, MidnightBSD
-dnl /etc/ssl/cert.pem OpenBSD, FreeBSD, MidnightBSD (symlink)
-dnl /etc/ssl/certs/ (ca path) SUSE
+dnl /usr/local/share/certs/ca-root-nss.crt MidnightBSD
+dnl /etc/ssl/cert.pem OpenBSD, MidnightBSD (symlink)
+dnl /etc/ssl/certs/ (CA path) SUSE, FreeBSD
 
 AC_DEFUN([CURL_CHECK_CA_BUNDLE], [