Add freqairl docker build process

docs/freqai-reinforcement-learning.md

@@ -1,7 +1,8 @@
 # Reinforcement Learning
 
 !!! Note "Installation size"
-    Reinforcement learning dependencies include large packages such as `torch`, which should be explicitly requested during `./setup.sh -i` by answering "y" to the question "Do you also want dependencies for freqai-rl (~700mb additional space required) [y/N]?" Users who prefer docker should ensure they use the docker image appended with `_freqaiRL`.
+    Reinforcement learning dependencies include large packages such as `torch`, which should be explicitly requested during `./setup.sh -i` by answering "y" to the question "Do you also want dependencies for freqai-rl (~700mb additional space required) [y/N]?".  
+    Users who prefer docker should ensure they use the docker image appended with `_freqairl`.
 
 ## Background and terminology