message: Clarify eager gradient doc strings
diff: @@ -171,8 +171,8 @@ def implicit_val_and_grad(f):
  """Returns a function which differentiates f with respect to variables.
  The wrapped function returns the value and the gradient of f when called with
  - the same arguments. The gradient is with respect to all TFE variables which
  - are either trainable or have `variable.watch()` called on them by f.
  + the same arguments. The gradient is with respect to all trainable TFE
  + variables accessed by `f`.
  This function is useful when the exact set of variables to differentiate with
  is not known ahead of time.
  @@ -249,8 +249,8 @@ def implicit_grad(f):
  """Returns a function which differentiates f with respect to variables.
  The wrapped function returns the gradient of f when called with the same
  - arguments. The gradient is with respect to all TFE variables which are
  - either trainable or have `variable.watch()` called on them by f.
  + arguments. The gradient is with respect to all trainable TFE variables
  + accessed by `f`.
  This function is useful when the exact set of variables to differentiate with
  is not known ahead of time.
  