[DOCS] Fix typo in limit example (Eventual-Inc#3303)

Co-authored-by: Colin Ho <[email protected]>

Author: colin-ho

daft/dataframe/dataframe.py

@@ -1601,7 +1601,7 @@ def limit(self, num: int) -> "DataFrame":
             │ ---   │
             │ Int64 │
             ╞═══════╡
-            │ 1     │ f
+            │ 1     │
             ├╌╌╌╌╌╌╌┤
             │ 2     │
             ├╌╌╌╌╌╌╌┤