ZF-5941: Typo in reference manual for Zend Date 12.6.4

Description

{quote}12.6.4. Self-Defined OUTPUT Formats Using PHP's date() Format Specifiers

If you are more comfortable with PHP's date format specifier than with ISO format specifiers, then you can use the Zend_Date::setOptions(array('format' => 'php')) method to switch Zend_Date methods from supporting ISO format specifiers to PHP date() type specifiers. {quote}

It should be format_type, not format

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