Add docs for analysis namespace (#3985)

diff --git a/docs/api/python/relay/analysis.rst b/docs/api/python/relay/analysis.rst
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@@ -0,0 +1,61 @@
+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+tvm.relay.analysis
+----------------------
+
+.. automodule:: tvm.relay.analysis
+
+.. autofunction:: tvm.relay.analysis.post_order_visit
+
+.. autofunction:: tvm.relay.analysis.well_formed
+
+.. autofunction:: tvm.relay.analysis.check_kind
+
+.. autofunction:: tvm.relay.analysis.check_constant
+
+.. autofunction:: tvm.relay.analysis.free_vars
+
+.. autofunction:: tvm.relay.analysis.bound_vars
+
+.. autofunction:: tvm.relay.analysis.all_vars
+
+.. autofunction:: tvm.relay.analysis.free_type_vars
+
+.. autofunction:: tvm.relay.analysis.bound_type_vars
+
+.. autofunction:: tvm.relay.analysis.all_type_vars
+
+.. autofunction:: tvm.relay.analysis.alpha_equal
+
+.. autofunction:: tvm.relay.analysis.assert_alpha_equal
+
+.. autofunction:: tvm.relay.analysis.graph_equal
+
+.. autofunction:: tvm.relay.analysis.assert_graph_equal
+
+.. autofunction:: tvm.relay.analysis.collect_device_info
+
+.. autofunction:: tvm.relay.analysis.collect_device_annotation_ops
+
+.. autofunction:: tvm.relay.analysis.get_total_mac_number
+
+.. autofunction:: tvm.relay.analysis.unmatched_cases
+
+.. autofunction:: tvm.relay.analysis.detect_feature
+
+.. autofunction:: tvm.relay.analysis.structural_hash