applies new doc guidelines to Active Record.

The focus of this change is to make the API more accessible.
References to method and classes should be linked to make it easy to
navigate around.

This patch makes exzessiv use of `rdoc-ref:` to provide more readable
docs. This makes it possible to document `ActiveRecord::Base#save` even
though the method is within a separate module
`ActiveRecord::Persistence`. The goal here is to bring the API closer to
the actual code that you would write.

This commit only deals with Active Record. The other gems will be
updated accordingly but in different commits. The pass through Active
Record is not completely finished yet. A follow up commit will change
the spots I haven't yet had the time to update.

/cc @fxn

1 files changed, 4 insertions, 3 deletions

diff --git a/activerecord/lib/active_record/sanitization.rb b/activerecord/lib/active_record/sanitization.rb
index 7f6664ea50..1cf4b09bf3 100644
--- a/activerecord/lib/active_record/sanitization.rb
+++ b/activerecord/lib/active_record/sanitization.rb
@@ -3,7 +3,8 @@ module ActiveRecord
     extend ActiveSupport::Concern
 
     module ClassMethods
-      # Used to sanitize objects before they're used in an SQL SELECT statement. Delegates to <tt>connection.quote</tt>.
+      # Used to sanitize objects before they're used in an SQL SELECT statement.
+      # Delegates to {connection.quote}[rdoc-ref:ConnectionAdapters::Quoting#quote].
       def sanitize(object) # :nodoc:
         connection.quote(object)
       end
@@ -53,8 +54,8 @@ module ActiveRecord
       end
 
       # Accepts a hash of SQL conditions and replaces those attributes
-      # that correspond to a +composed_of+ relationship with their expanded
-      # aggregate attribute values.
+      # that correspond to a {#composed_of}[rdoc-ref:Aggregations::ClassMethods#composed_of]
+      # relationship with their expanded aggregate attribute values.
       #
       # Given:
       #