Improve documentation wording and formatting

lib/rubocop/cop/obsession/method_order.rb

@@ -3,7 +3,8 @@
 module RuboCop
   module Cop
     module Obsession
-      # This cop checks for private/protected methods that are not ordered correctly.
+      # This cop checks for private/protected methods that are not ordered
+      # correctly. It supports autocorrect.
       #
       # Code should read from top to bottom: methods should be defined in the
       # same order as the order when they are first mentioned.

lib/rubocop/cop/obsession/rails/fully_defined_json_field.rb

@@ -8,12 +8,12 @@ module Rails
         # defaults or comments.
         #
         # - json(b) fields should have a default value like {} or [] so code can
-        # do my_field['field'] or my_field.first without fear that my_field is
-        # nil.
+        #   do my_field['field'] or my_field.first without fear that my_field is
+        #   nil.
         # - It is impossible to know the structure of a json(b) field just by
-        # reading the schema, because json(b) is an unstructured type. That's why
-        # an "Example: ..." Postgres comment should always be present when
-        # defining the field.
+        #   reading the schema, because json(b) is an unstructured type. That's why
+        #   an "Example: ..." Postgres comment should always be present when
+        #   defining the field.
         #
         # @example
         #