update tool description

app.py

@@ -13,7 +13,7 @@ def get_nth_fibonacci_number(n:int)-> int: #it's import to specify the return ty
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A tool that computes the nth fibonacci number
     Args:
-        n: the index of the fibonacci number you want to know
+        n: an integer with the index of the fibonacci number you want to know (e.g., 5).
     """
     if n == 0:
         return 0
@@ -31,8 +31,8 @@ def get_nth_fibonacci_number(n:int)-> int: #it's import to specify the return ty
 def count_letters_in_word(word:str, letter:str)->int:
     """A tool that enables you to know how many instances of one letter appear in a specific wordl 
     Args:
-        word: the word to count letters on
-        letter: the letter to count inside the word.
+        word: a string with the word to count letters on (e.g., "strawberry").
+        letter: a string with the letter to count inside the word. (e.g., "r")
     """
     return word.count(letter)