Update pins/boards.py

Author: isabelizimm

pins/boards.py

@@ -334,7 +334,7 @@ def pin_write(
             Pin name.
         type:
             File type used to save `x` to disk. May be "csv", "arrow", "parquet",
-            "joblib", "json", or "file".
+            "joblib", or "json".
         title:
             A title for the pin; most important for shared boards so that others
             can understand what the pin contains. If omitted, a brief description