docs: replace word factor with categorical

Author: machow

docs/articles/customize-pins-metadata.Rmd

@@ -65,9 +65,9 @@ some_cat = pd.Categorical(["a", "a", "b", "c"])
 pin_write_cat_json(board, some_cat, name = "some-cat")
 ```
 
-## A function to read factors
+## A function to read categoricals
 
-It's possible to read this pin using the regular `pin_read()` function, but the object we get is no longer a factor!
+It's possible to read this pin using the regular `pin_read()` function, but the object we get is no longer a categorical!
 
 ```{python}
 board.pin_read("some-cat")
@@ -82,12 +82,12 @@ board.pin_meta("some-cat")
 This enables us to write a special function for reading, to reconstruct the categorical, using the categories stashed in metadata:
 
 ```{python}
-def pin_read_factor_json(board, name, version=None, hash=None, **kwargs):
+def pin_read_cat_json(board, name, version=None, hash=None, **kwargs):
   data = board.pin_read(name = name, version = version, hash = hash, **kwargs)
   meta = board.pin_meta(name = name, version = version, **kwargs)
   return pd.Categorical(data, categories=meta.user["categories"])
 
-pin_read_factor_json(board, "some-cat")
+pin_read_cat_json(board, "some-cat")
 ```
 
 For an example of how this approach is used in a real project, look at how