add is_array modifier doc (#984)

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diff --git a/docs/designers/language-modifiers/language-modifier-is_array.md b/docs/designers/language-modifiers/language-modifier-is_array.md
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+# is_array
+
+Return true if the variable passed to it is an array.
+
+## Basic usage
+
+```smarty
+{if $myVar|is_array}it's an array{/if}
+```