fixes in api docs

activerecord/lib/active_record/railties/jdbcmysql_error.rb

 #FIXME Remove if ArJdbcMysql will give.
-module ArJdbcMySQL
+module ArJdbcMySQL #:nodoc:
   class Error < StandardError
     attr_accessor :error_number, :sql_state
 

activesupport/lib/active_support/core_ext/hash/indifferent_access.rb

@@ -14,7 +14,7 @@ def with_indifferent_access
   # #with_indifferent_access. This method will be called on the current object
   # by the enclosing object and is aliased to #with_indifferent_access by
   # default. Subclasses of Hash may overwrite this method to return +self+ if
-  # converting to an +ActiveSupport::HashWithIndifferentAccess+ would not be
+  # converting to an <tt>ActiveSupport::HashWithIndifferentAccess</tt> would not be
   # desirable.
   #
   #   b = {:b => 1}

activesupport/lib/active_support/json/encoding.rb

@@ -148,8 +148,8 @@ def as_json(options = nil) #:nodoc:
   end
 end
 
-class Struct
-  def as_json(options = nil) #:nodoc:
+class Struct #:nodoc:
+  def as_json(options = nil)
     Hash[members.zip(values)]
   end
 end

railties/lib/rails/commands/benchmarker.rb

@@ -21,7 +21,7 @@ def options
   options
 end
 
-class BenchmarkerTest < ActionDispatch::PerformanceTest
+class BenchmarkerTest < ActionDispatch::PerformanceTest #:nodoc:
   self.profile_options = options
 
   ARGV.each do |expression|

railties/lib/rails/commands/profiler.rb

@@ -19,7 +19,7 @@ def options
   options
 end
 
-class ProfilerTest < ActionDispatch::PerformanceTest
+class ProfilerTest < ActionDispatch::PerformanceTest #:nodoc:
   self.profile_options = options
 
   ARGV.each do |expression|