[DOCS] Add docs of logical snd right shift (#1834)

docs/langref/relay_op.rst

@@ -45,6 +45,7 @@ This level enables typical convnet models.
 .. autosummary::
    :nosignatures:
 
+   tvm.relay.right_shift
    tvm.relay.equal
    tvm.relay.not_equal
    tvm.relay.greater
@@ -66,3 +67,14 @@ Level 1 Definitions
 Level 2 Definitions
 -------------------
 .. autofunction:: tvm.relay.nn.conv2d
+
+
+Level 4 Definitions
+-------------------
+.. autofunction:: tvm.relay.right_shift
+.. autofunction:: tvm.relay.equal
+.. autofunction:: tvm.relay.not_equal
+.. autofunction:: tvm.relay.greater
+.. autofunction:: tvm.relay.greater_equal
+.. autofunction:: tvm.relay.less
+.. autofunction:: tvm.relay.less_equal