Document that dict.fromkeys accepts any iterable for keys (GH-10998)

Doc/library/stdtypes.rst

@@ -4239,9 +4239,9 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
 
       Return a shallow copy of the dictionary.
 
-   .. classmethod:: fromkeys(seq[, value])
+   .. classmethod:: fromkeys(iterable[, value])
 
-      Create a new dictionary with keys from *seq* and values set to *value*.
+      Create a new dictionary with keys from *iterable* and values set to *value*.
 
       :meth:`fromkeys` is a class method that returns a new dictionary. *value*
       defaults to ``None``.