Fix typos in spaces

Fix typo to fit the context

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Update tail.md

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snippets/getDaysDiffBetweenDates.md

@@ -2,7 +2,7 @@
 
 Returns the difference (in days) between two dates.
 
-Calculate the difference (in days) between to `Date` objects.
+Calculate the difference (in days) between two `Date` objects.
 
 ```js
 const getDaysDiffBetweenDates = (dateInitial, dateFinal) => (dateFinal - dateInitial) / (1000 * 3600 * 24);