Apache MXNet rename (#11871)

* MXNet

MXNet renaming into Apache MXNet

* Update docs/MO_DG/prepare_model/Model_Optimizer_FAQ.md

Co-authored-by: Helena Kloosterman <helena.kloosterman@intel.com>

* MXNet 2

* MXNet 3

* Revert "MXNet 3"

This reverts commit 046c25239d.

Co-authored-by: Helena Kloosterman <helena.kloosterman@intel.com>

docs/ops/detection/DeformablePSROIPooling_1.md

@@ -13,7 +13,7 @@ If only two inputs are provided, position sensitive pooling with regular ROI bin
 If third input is provided, each bin position is transformed by adding corresponding offset to the bin left top corner coordinates. Third input values are usually calculated by regular position sensitive pooling layer, so non-deformable mode (DeformablePSROIPooling with two inputs).
 The ROI coordinates are specified as five element tuples: `[batch_id, x_1, y_1, x_2, y_2]` in absolute values.
 
-This operation is compatible with [MXNet DeformablePSROIPooling](https://mxnet.apache.org/versions/1.7.0/api/python/docs/api/contrib/symbol/index.html#mxnet.contrib.symbol.DeformablePSROIPooling) cases where `group_size` is equal to `pooled_size`.
+This operation is compatible with [Apache MXNet DeformablePSROIPooling](https://mxnet.apache.org/versions/1.7.0/api/python/docs/api/contrib/symbol/index.html#mxnet.contrib.symbol.DeformablePSROIPooling) cases where `group_size` is equal to `pooled_size`.
 
 **Attributes**
 

docs/ops/detection/DetectionOutput_1.md

@@ -101,8 +101,8 @@ At each feature map cell, *DetectionOutput* predicts the offsets relative to the
 
   * **Description**: *decrease_label_id* flag that denotes how to perform NMS.
   * **Range of values**:
-    * false - perform NMS like in Caffe\*.
-    * true - perform NMS like in MxNet\*.
+    * false - perform NMS like in Caffe.
+    * true - perform NMS like in Apache MxNet.
   * **Type**: boolean
   * **Default value**: false
   * **Required**: *no*

docs/ops/detection/DetectionOutput_8.md

@@ -108,8 +108,8 @@ it is necessary to adjust the predicted offset accordingly.
 
   * **Description**: *decrease_label_id* flag that denotes how to perform NMS.
   * **Range of values**:
-    * false - perform NMS like in Caffe\*.
-    * true - perform NMS like in MxNet\*.
+    * false - perform NMS like in Caffe.
+    * true - perform NMS like in Apache MxNet.
   * **Type**: boolean
   * **Default value**: false
   * **Required**: *no*