Add link to spec (#613)

* Add link to spec

* Make entity lowercase for consistency
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Sebastian Hädrich 2021-05-21 14:24:46 +02:00 committed by GitHub
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@ -73,7 +73,8 @@
<term><parameter>isostr</parameter></term>
<listitem>
<para>
An ISO 8601 repeating interval specification.
An <link
xlink:href="&url.iso-8601.repeating_intervals;">ISO 8601 repeating interval specification</link>.
Zero occurrences (<literal>R0/</literal>) are not supported.
</para>
</listitem>