Remove Bootstrap option from generator docs (#1575)

Author: ahangarha

docs/additional-details/generator-details.md

@@ -1,6 +1,6 @@
 # Generator Details
 
-The `react_on_rails:install` generator combined with the example pull requests of generator runs will get you up and running efficiently. There's a fair bit of setup with integrating Webpack with Rails. Defaults for options are such that the default is for the flag to be off. For example, the default for `-R` is that `redux` is off, and the default of `-b` is that `skip-bootstrap` is off.
+The `react_on_rails:install` generator combined with the example pull requests of generator runs will get you up and running efficiently. There's a fair bit of setup with integrating Webpack with Rails. Defaults for options are such that the default is for the flag to be off. For example, the default for `-R` is that `redux` is off.
 
 Run `rails generate react_on_rails:install --help` for descriptions of all available options: