Update SSL Certs (#78884)

* Update SSL Certs

The [example below](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-ssl.html#security-api-ssl-example) shows `has_private_key` can also be `false` (as expected for a bool field data type).

* Update wording

Co-authored-by: Adam Locke <adam.locke@elastic.co>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/docs/en/rest-api/security/ssl.asciidoc

@@ -68,8 +68,8 @@ single certificate. The fields in each object are:
 `subject_dn`:: (string) The Distinguished Name of the certificate's subject.
 `serial_number`:: (string) The hexadecimal representation of the certificate's
 serial number.
-`has_private_key`:: (Boolean) If {es} has access to the private key for this
-certificate, this field has a value of `true`.
+`has_private_key`:: (Boolean) Indicates whether {es} has access to the private
+key for this certificate.
 `expiry`:: (string) The ISO formatted date of the certificate's expiry
 (not-after) date.