Fixed-width == and === docs do not work with RDoc short-hand

``` $ echo '+foo+' | rdoc --pipe <p><code>foo</code></p> $ echo '+==+' | rdoc --pipe <p>+==+</p> ```

Author: zzak

activerecord/lib/active_record/attribute_methods/serialization.rb

@@ -58,9 +58,9 @@ module ClassMethods
  # semantically equal to be considered different.
  # For instance two hashes with the same keys and values but a different order have a
  # different serialized representation, but are semantically equal once deserialized.
- # If set to +true+ the comparison will be done on the deserialized object. This options
- # should only be enabled if the +type+ is known to have a proper +==+ method that deeply
- # compare the objects.
+ # If set to +true+ the comparison will be done on the deserialized object.
+ # This options should only be enabled if the +type+ is known to have
+ # a proper <tt>==</tt> method that deeply compare the objects.
  # * +yaml+ - Optional. Yaml specific options. The allowed config is:
  # * +:permitted_classes+ - +Array+ with the permitted classes.
  # * +:unsafe_load+ - Unsafely load YAML blobs, allow YAML to load any class.

activerecord/lib/active_record/relation/predicate_builder.rb

@@ -37,7 +37,7 @@ def self.references(attributes)
 
  # Define how a class is converted to Arel nodes when passed to +where+.
  # The handler can be any object that responds to +call+, and will be used
- # for any value that +===+ the class given. For example:
+ # for any value that <tt>===</tt> the class given. For example:
  #
  # MyCustomDateRange = Struct.new(:start, :end)
  # handler = proc do |column, range|