Fix rdoc syntax for Kernel.Float (rails#46860)

Author: zzak

activemodel/lib/active_model/validations/numericality.rb

@@ -148,10 +148,11 @@ def record_attribute_changed_in_place?(record, attr_name)
 
     module HelperMethods
       # Validates whether the value of the specified attribute is numeric by
-      # trying to convert it to a float with Kernel.Float (if <tt>only_integer</tt>
-      # is +false+) or applying it to the regular expression <tt>/\A[\+\-]?\d+\z/</tt>
-      # (if <tt>only_integer</tt> is set to +true+). Precision of Kernel.Float values
-      # are guaranteed up to 15 digits.
+      # trying to convert it to a float with +Kernel.Float+ (if
+      # <tt>only_integer</tt> is +false+) or applying it to the regular
+      # expression <tt>/\A[\+\-]?\d+\z/</tt> (if <tt>only_integer</tt> is set to
+      # +true+). Precision of +Kernel.Float+ values are guaranteed up to 15
+      # digits.
       #
       #   class Person < ActiveRecord::Base
       #     validates_numericality_of :value, on: :create

activerecord/lib/active_record/validations/numericality.rb

@@ -21,10 +21,11 @@ def column_scale_for(record, attribute)
 
     module ClassMethods
       # Validates whether the value of the specified attribute is numeric by
-      # trying to convert it to a float with Kernel.Float (if <tt>only_integer</tt>
-      # is +false+) or applying it to the regular expression <tt>/\A[\+\-]?\d+\z/</tt>
-      # (if <tt>only_integer</tt> is set to +true+). Kernel.Float precision
-      # defaults to the column's precision value or 15.
+      # trying to convert it to a float with +Kernel.Float+ (if
+      # <tt>only_integer</tt> is +false+) or applying it to the regular
+      # expression <tt>/\A[\+\-]?\d+\z/</tt> (if <tt>only_integer</tt> is set to
+      # +true+). +Kernel.Float+ precision defaults to the column's precision
+      # value or 15.
       #
       # See ActiveModel::Validations::HelperMethods.validates_numericality_of for more information.
       def validates_numericality_of(*attr_names)