PHP 8.1 | MigrationGuide/New constants: add missing constants [1]

> * Added CURLOPT_DOH_URL option

> * Added certificate blob options when for libcurl >= 7.71.0:
>
>         CURLOPT_ISSUERCERT_BLOB
>         CURLOPT_PROXY_ISSUERCERT
>         CURLOPT_PROXY_ISSUERCERT_BLOB
>         CURLOPT_PROXY_SSLCERT_BLOB
>         CURLOPT_PROXY_SSLKEY_BLOB
>         CURLOPT_SSLCERT_BLOB
>         CURLOPT_SSLKEY_BLOB

Refs:
* https://github.com/php/php-src/blob/f67986a9218f4889d9352a87c29337a5b6eaa4bd/UPGRADING#L220-L229
* php/php-src#6612
* php/php-src@3dad63b
* php/php-src#7194
* php/php-src@b11785c

Author: jrfnl

appendices/migration81/constants.xml

@@ -2,6 +2,37 @@
 <sect1 xml:id="migration81.constants" xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>New Global Constants</title>
 
+ <sect2 xml:id="migration81.constants.curl">
+  <title>cURL</title>
+
+  <itemizedlist>
+   <listitem>
+    <simpara><constant>CURLOPT_DOH_URL</constant></simpara>
+   </listitem>
+   <listitem>
+    <simpara><constant>CURLOPT_ISSUERCERT_BLOB</constant></simpara>
+   </listitem>
+   <listitem>
+    <simpara><constant>CURLOPT_PROXY_ISSUERCERT</constant></simpara>
+   </listitem>
+   <listitem>
+    <simpara><constant>CURLOPT_PROXY_ISSUERCERT_BLOB</constant></simpara>
+   </listitem>
+   <listitem>
+    <simpara><constant>CURLOPT_PROXY_SSLCERT_BLOB</constant></simpara>
+   </listitem>
+   <listitem>
+    <simpara><constant>CURLOPT_PROXY_SSLKEY_BLOB</constant></simpara>
+   </listitem>
+   <listitem>
+    <simpara><constant>CURLOPT_SSLCERT_BLOB</constant></simpara>
+   </listitem>
+   <listitem>
+    <simpara><constant>CURLOPT_SSLKEY_BLOB</constant></simpara>
+   </listitem>
+  </itemizedlist>
+ </sect2>
+
  <sect2 xml:id="migration81.constants.mysqli">
   <title>MySQLi</title>