fix typo

Author: aryehraber

source/api/filters.md

@@ -89,7 +89,7 @@ Wrap the handler so it only gets called when the keyCode matches the argument. Y
 - this filter only works with `v-on`
 - this filter takes one optional argument
 
-Wrap the handler to debounce it for X milliseconds, where X is the argument. Default is 300ms. A debounced handler will be delayed until at least X ms has passed after the call moment; if the handler is called again before the delay period, the delay poriod is reset to X ms.
+Wrap the handler to debounce it for X milliseconds, where X is the argument. Default is 300ms. A debounced handler will be delayed until at least X ms has passed after the call moment; if the handler is called again before the delay period, the delay period is reset to X ms.
 
 ### filterBy