Added docs for #indexes on adapters

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -611,6 +611,7 @@ module ActiveRecord
         super(table_name, options)
       end
 
+      # Returns an array of indexes for the given table.
       def indexes(table_name, name = nil)#:nodoc:
         indexes = []
         current_index = nil

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -690,7 +690,7 @@ module ActiveRecord
         [schema, table]
       end
 
-      # Returns the list of all indexes for a table.
+      # Returns an array of indexes for the given table.
       def indexes(table_name, name = nil)
          schemas = schema_search_path.split(/,/).map { |p| quote(p) }.join(',')
          result = query(<<-SQL, name)

activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb

@@ -263,6 +263,7 @@ module ActiveRecord
         end
       end
 
+      # Returns an array of indexes for the given table.
       def indexes(table_name, name = nil) #:nodoc:
         exec_query("PRAGMA index_list(#{quote_table_name(table_name)})", name).map do |row|
           IndexDefinition.new(