Fix typo

site/docs/guide/filter-queries.md

@@ -347,7 +347,7 @@ In this case, you will be provided with helpful error messages.
 The validation of the filter queries happens only once, when the bot is initialized and `bot.on()` is called.
 
 On start-up, grammY derives a predicate function from the filter query by splitting it into its query parts.
-Every part will be mapped to a function that performs a single check truthiness check for an object property, or two checks if the part is omitted and two values need to be checked.
+Every part will be mapped to a function that performs a single truthiness check for an object property, or two checks if the part is omitted and two values need to be checked.
 These functions are then combined to form a predicate that only has to check for as many values as are relevant for the query, without iterating over the object keys of `Update`.
 
 This system uses less operations than some competing libraries, which need to perform containment checks in arrays when routing updates.