Document hashtext() and Friends?

Hackers,

Is there a reason that hashtext() and friends are not documented? Given that they’re likely to be used more and more for partitioning and sharding, I think it would be useful to do so, starting with something like this. Comments?

*** a/doc/src/sgml/func.sgml
--- b/doc/src/sgml/func.sgml
***************
*** 1557,1562 ****
--- 1557,1577 ----
<row>
<entry>
<indexterm>
+ <primary>hashtext</primary>
+ </indexterm>
+ <literal><function>hashtext(<parameter>string</parameter>)</function></literal>
+ </entry>
+ <entry><type>int</type></entry>
+ <entry>
+ Generate a hash value for string.
+ </entry>
+ <entry><literal>hashtext('greetings, human')</literal></entry>
+ <entry><literal>-1132466231</literal></entry>
+ </row>
+
+ <row>
+ <entry>
+ <indexterm>
<primary>left</primary>
</indexterm>
<literal><function>left(<parameter>str</parameter> <type>text</type>,

Best

David