docs 5/n (#15669)

* examples

* fix few examples

* Update pl_multinode.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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

docs/source-app/levels/basic/hello_components/pl_multinode.py

@@ -14,7 +14,7 @@ def run():
 # 8 GPU: (2 nodes of 4 x v100)
 component = LightningTrainerMultiNode(
     LightningTrainerDistributed,
-    num_nodes=2,
+    num_nodes=4,
     cloud_compute=L.CloudCompute("gpu-fast-multi"), # 4 x v100
 )
 app = L.LightningApp(component)

docs/source-app/levels/basic/hero_components.rst

@@ -1,7 +1,7 @@
 .. lit_tabs::
    :titles: Hello world; Hello GPU world; PyTorch & ⚡⚡⚡ Trainer (1+ cloud GPUs); Train PyTorch (cloud GPU); Train PyTorch (32 cloud GPUs); Deploy a model on cloud GPUs; Run a model script;  XGBoost; Streamlit demo
    :code_files: /levels/basic/hello_components/hello_world.py; /levels/basic/hello_components/hello_world_gpu.py; /levels/basic/hello_components/pl_multinode.py; /levels/basic/hello_components/train_pytorch.py; /levels/basic/hello_components/pt_multinode.py; /levels/basic/hello_components/deploy_model.py; /levels/basic/hello_components/run_ptl_script.py; /levels/basic/hello_components/xgboost.py; /levels/basic/hello_components/streamlit_demo.py
-   :highlights: 7; 10, 11; 10-12, 17, 18; 4, 8, 12, 18-19, 26; 5, 10, 22, 28, 32, 42, 58-60; 3, 11-13, 25, 30; 7, 10; 15, 21; 9, 15, 24
+   :highlights: 7; 10, 11; 10-12, 17, 18; 4, 8, 12, 18-19, 26; 5, 10, 22, 28, 32, 42, 58-60; 3, 11-12, 25, 29; 7, 10; 15, 21; 9, 15, 24
    :app_id: abc123
    :tab_rows: 3
    :height: 620px