Update snippet descriptions

snippets/unfold.md

@@ -7,7 +7,7 @@ Builds a list, using an iterator function and an initial seed value.
 
 - The iterator function accepts one argument (`seed`) and must always return a list with two elements ([`value`, `nextSeed`]) or `False` to terminate.
 - Use a generator function, `fn_generator`, that uses a `while` loop to call the iterator function and `yield` the `value` until it returns `False`.
-- Use list comprehension to return the list that is produced by the generator, using the iterator function.
+- Use a list comprehension to return the list that is produced by the generator, using the iterator function.
 
 ```py
 def unfold(fn, seed):