fix generated docs (#835)

* fix generated docs

* add new lines in returns

Author: KazuCocoa

appium_lib.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'nokogiri', '~> 1.8', '>= 1.8.1'
   s.add_runtime_dependency 'tomlrb', '~> 1.1'
 
-  s.add_development_dependency 'appium_thor', '~> 1.1', '>= 1.1.2'
+  s.add_development_dependency 'appium_thor', '~> 1.1', '>= 1.1.4'
   s.add_development_dependency 'fakefs', '~> 0.13.0'
   s.add_development_dependency 'hashdiff', '~> 0.3.7'
   s.add_development_dependency 'posix-spawn', '~> 0.3'