Update family.mdx grammar (#2762)

docs/utilities/family.mdx

@@ -71,7 +71,7 @@ This is crucial if you use infinite number of params.
 There are two ways to remove params.
 
 - `myFamily.remove(param)` allows you to remove a specific param.
-- `myFamily.setShouldRemove(shouldRemove)` is to register `shouldRemove` function which runs immediately **and** when you are to get an atom from a cache.
+- `myFamily.setShouldRemove(shouldRemove)` is to register `shouldRemove` function which runs immediately **and** when you are about to get an atom from a cache.
   - shouldRemove is a function that takes two arguments `createdAt` in milliseconds and `param`, and returns a boolean value.
   - setting `null` will remove the previously registered function.