Added Eps doc

Author: ycastorium

lib/nx_signal/windows.ex

@@ -301,6 +301,7 @@ defmodule NxSignal.Windows do
        otherwise produces a symmetric window. Defaults to `true`
     * `:type` - the output type for the window. Defaults to `{:f, 32}`
     * `:beta` - Shape parameter for the window. As beta increases, the window becomes more focused in frequency domain. Defaults to 12.0.
+    * `:eps` - Epsilon value to avoid division by zero. Defaults to 1.0e-7.
     * `:axis_name` - the axis name. Defaults to `nil`
 
   ## Examples