curl: Clarify correct behaviour of CURLOPT_CAINFO_BLOB (#4746)

Author: ericnorris

reference/curl/constants_curl_setopt.xml

@@ -183,8 +183,8 @@
    </term>
    <listitem>
     <para>
-     A <type>string</type> with the name of a PEM file holding one or more certificates to verify the
-     peer with. This option overrides <constant>CURLOPT_CAINFO</constant>.
+     A binary <type>string</type> of PEM encoded content holding one or more certificates to verify
+     the peer with. This option overrides <constant>CURLOPT_CAINFO</constant>.
      Available as of PHP 8.2.0 and cURL 7.77.0.
     </para>
    </listitem>