Fix documentation of path(polygon) function.

Obviously, this returns type "path", but somebody made a copy-and-pasteo
long ago.

Dagfinn Ilmari Mannsåker

Author: tglsfdc

doc/src/sgml/func.sgml

@@ -7237,7 +7237,7 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
        </row>
        <row>
         <entry><literal><function>path</function>(<type>polygon</type>)</literal></entry>
-        <entry><type>point</type></entry>
+        <entry><type>path</type></entry>
         <entry>polygon to path</entry>
         <entry><literal>path(polygon '((0,0),(1,1),(2,0))')</literal></entry>
        </row>