Update trigonometric func docs adding broadcast info

Author: vlad-perevezentsev

dpnp/dpnp_iface_trigonometric.py

@@ -516,6 +516,8 @@ def _get_accumulation_res_dt(a, dtype, _out):
     Second input array, also expected to have a real-valued
     floating-point data type.
     Both inputs `x1` and `x2` can not be scalars at the same time.
+    If ``x1.shape != x2.shape``, they must be broadcastable to a common shape
+    (which becomes the shape of the output).
 out : {None, dpnp.ndarray, usm_ndarray}, optional
     Output array to populate.
     Array must have the correct shape and the expected data type.
@@ -1198,6 +1200,8 @@ def cumlogsumexp(
 x2 : {dpnp.ndarray, usm_ndarray, scalar}
     Second input array, also expected to have a real-valued data type.
     Both inputs `x1` and `x2` can not be scalars at the same time.
+    If ``x1.shape != x2.shape``, they must be broadcastable to a common shape
+    (which becomes the shape of the output).
 out : {None, dpnp.ndarray, usm_ndarray}, optional
     Output array to populate.
     Array must have the correct shape and the expected data type.
@@ -1503,6 +1507,8 @@ def cumlogsumexp(
     Second input array, also expected to have a real-valued
     floating-point data type.
     Both inputs `x1` and `x2` can not be scalars at the same time.
+    If ``x1.shape != x2.shape``, they must be broadcastable to a common shape
+    (which becomes the shape of the output).
 out : {None, dpnp.ndarray, usm_ndarray}, optional
     Output array to populate.
     Array must have the correct shape and the expected data type.
@@ -1575,6 +1581,8 @@ def cumlogsumexp(
     Second input array, also expected to have a real-valued
     floating-point data type.
     Both inputs `x1` and `x2` can not be scalars at the same time.
+    If ``x1.shape != x2.shape``, they must be broadcastable to a common shape
+    (which becomes the shape of the output).
 out : {None, dpnp.ndarray, usm_ndarray}, optional
     Output array to populate.
     Array must have the correct shape and the expected data type.