Port TorchRL tutorial for DDPG Loss to pytorch.org (#2413)

* Port TorchRL tutorial for DDPG Loss to pytorch.org
---------

Co-authored-by: Svetlana Karslioglu <svekars@fb.com>
Co-authored-by: Vincent Moens <vincentmoens@gmail.com>

en-wordlist.txt

@@ -32,6 +32,7 @@ ConvNets
 DCGAN
 DCGANs
 DDP
+DDPG
 DDQN
 DLRM
 DNN
@@ -119,6 +120,8 @@ Numpy's
 ONNX
 OpenAI
 OpenMP
+Ornstein
+OU
 PIL
 PPO
 Plotly
@@ -150,6 +153,7 @@ Spacy
 TPU
 TensorBoard
 TensorBoards
+TensorDict
 TextVQA
 Tokenization
 TorchDynamo
@@ -160,6 +164,7 @@ TorchRL's
 TorchScript
 TorchX
 Tunable
+Uhlenbeck
 UI
 Unescape
 VGG
@@ -214,6 +219,7 @@ cpu
 csv
 cuDNN
 datafile
+dataflow
 dataframe
 dataloader
 dataloaders
@@ -238,6 +244,7 @@ elementwise
 embeddings
 encodings
 ensembling
+enum
 eq
 et
 evaluateInput
@@ -358,6 +365,7 @@ resnet
 restride
 rewinded
 rollout
+rollouts
 romanized
 runnable
 runtime
@@ -384,6 +392,7 @@ subreddit
 subregion
 subregion's
 summarization
+swappable
 tanh
 th
 thresholding

index.rst

@@ -295,6 +295,14 @@ What's new in PyTorch tutorials?
    :link: intermediate/mario_rl_tutorial.html
    :tags: Reinforcement-Learning
 
+.. customcarditem::
+   :header: Code a DDPG Loss
+   :card_description: Use TorchRL to code a DDPG Loss
+   :image: _static/img/half_cheetah.gif
+   :link: intermediate/coding_ddpg.html
+   :tags: Reinforcement-Learning
+
+
 
 .. Deploying PyTorch Models in Production