Remove unnecessary whitespace in README.md and /lib/locales/README.md (#3209)

Author: ryotaro-shirai

README.md

@@ -157,7 +157,7 @@ To prevent Faker (version >= 2.22) from [generating duplicate values](https://gi
 you might need to add the following to the `test_helper.rb` or `rails_helper.rb` file:
 
 ```ruby
-  Faker::Config.random = Random.new
+Faker::Config.random = Random.new
 ```
 
 ## Generators

lib/locales/README.md

@@ -52,5 +52,5 @@ Faker::Config.default_locale = :pt
 In threaded server environments, e.g., Puma, locale per thread can be set as the following:
 
 ```ruby
-  Faker::Config.locale = :es
+Faker::Config.locale = :es
 ```