AVG probably shouldn't be upper case here, considering

that we don't upcase the others.

doc/src/sgml/func.sgml

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 PostgreSQL documentation
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@@ -4534,7 +4534,7 @@ SELECT has_table_privilege('myschema.mytable', 'select');
 
     <tbody>
      <row>
-      <entry>AVG(<replaceable class="parameter">expression</replaceable>)</entry>
+      <entry>avg(<replaceable class="parameter">expression</replaceable>)</entry>
       <entry>the average (arithmetic mean) of all input values</entry>
       <entry>
        <indexterm>