Replace deprecated distributed_backend by acc in examples (#7795)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: kaushikb11

docs/source/ecosystem/asr_nlp_tts.rst

@@ -160,7 +160,7 @@ for the entire speech to text .yaml file.
         max_epochs: 5
         max_steps: null # computed at runtime if not set
         num_nodes: 1
-        distributed_backend: ddp
+        accelerator: ddp
         ...
     # configure the ASR model
     model:
@@ -598,7 +598,7 @@ Specify TTS Model Configurations with YAML File
         gpus: -1 # number of gpus
         max_epochs: 350
         num_nodes: 1
-        distributed_backend: ddp
+        accelerator: ddp
         ...
 
     # configure the TTS model

notebooks/08-Domain-specific-demos.ipynb

@@ -1669,9 +1669,8 @@
     "\n",
     "    trainer = pl.Trainer(\n",
     "        gpus=1,\n",
-    "        distributed_backend='dp',\n",
+    "        accelerator='dp',\n",
     "        max_epochs=500,\n",
-    "        early_stop_callback=False,\n",
     "        val_check_interval=100\n",
     "    )\n",
     "\n",