Update instructions.py (#3060)

Author: maximevtush

lm_eval/tasks/ifeval/instructions.py

@@ -740,7 +740,7 @@ def strip_changes(self, response):
 
 
 class KeywordChecker(Instruction):
-    """Check the exisitence of certain keywords."""
+    """Check the existence of certain keywords."""
 
     def build_description(self, *, keywords=None):
         """Build the instruction description.
@@ -1161,7 +1161,7 @@ def build_description(self, *, original_paragraph, low, high):
 
         Args:
           original_paragraph: A string presenting the original paragraph. The
-            rephrases response should have betweeb low-high words in common.
+            rephrases response should have between low-high words in common.
           low: An integer presenting the lower bound of similar words.
           high: An integer representing the upper bound of similar words.