rss_update_frequency FILTER

[ramiy]

In "wp-includes/feed-rss2.php" we have 2 filters:

<sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>

<sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>

but in "wp-includes/feed-rdf.php" we have only 1 filter:

<sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>

<sy:updateFrequency>1</sy:updateFrequency>

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This patch addes the "rss_update_frequency" filter to feed-rdf.php file.

[dd32]

(In [13002]) Add missing filter to sy:updateFrequency in RDF feed. Props ramiy. Fixes #12156