Update index.asciidoc

Author: yaauie

docs/index.asciidoc

@@ -348,10 +348,13 @@ NOTE: This setting can be used only if <<plugins-{type}s-{plugin}-ssl_key>> is s
 ===== `ssl_certificate_authorities`
 
  * Value type is a list of <<path,path>>
+ * This plugin does not support multiple entries
  * There is no default value for this setting
 
 The .cer or .pem CA files to validate the server's certificate.
 
+NOTE: When provided with a single PEM file that contains multiple certificates, all enclosed certificates will be trusted.
+
 [id="plugins-{type}s-{plugin}-ssl_cipher_suites"]
 ===== `ssl_cipher_suites`
 
@@ -510,4 +513,4 @@ The plugin will fail to start if it contains any of these obsolete options.
 [id="plugins-{type}s-{plugin}-common-options"]
 include::{include_path}/{type}.asciidoc[]
 
-:default_codec!:
+:default_codec!: