Example docs formatting (#1364)

* update basic examples

* update domain examples

* reinforse -> reinforce

* update full examples

* update multi node examples

* update examples readme

* fix copy paste

* fix line too long

pl_examples/basic_examples/gpu_template.py

@@ -1,5 +1,5 @@
 """
-Runs a model on a single node across N-gpus.
+Runs a model on a single node across multiple gpus.
 """
 import os
 from argparse import ArgumentParser