Fix GH-4718: Incorrect "See also" in pcntl_setcpuaffinity() manual page (#4736)

Author: nielsdos

reference/pcntl/functions/pcntl-setcpuaffinity.xml

@@ -63,7 +63,7 @@
  <refsect1 role="seealso">
   &reftitle.seealso;
   <simplelist>
-   <member><function>pcntl_setcpuaffinity</function></member>
+   <member><function>pcntl_getcpuaffinity</function></member>
   </simplelist>
  </refsect1>