[ci skip] Remove comments about Rails 3.1

Stems from https://github.com/rails/rails/pull/20105#issuecomment-100900939
where @senny said:

> From my point of view, all the docs (guides, API) are version bound.
> They should describe that version and continue to be available when newer versions are released.
> The cross referencing can be done by the interested user.

2 files changed, 3 insertions, 18 deletions

diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index ef446ce596..192a456846 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -275,21 +275,6 @@ module ActiveRecord
   # The phrase "Updating salaries..." would then be printed, along with the
   # benchmark for the block when the block completes.
   #
-  # == About the schema_migrations table
-  #
-  # Rails versions 2.0 and prior used to create a table called
-  # <tt>schema_info</tt> when using migrations. This table contained the
-  # version of the schema as of the last applied migration.
-  #
-  # Starting with Rails 2.1, the <tt>schema_info</tt> table is
-  # (automatically) replaced by the <tt>schema_migrations</tt> table, which
-  # contains the version numbers of all the migrations applied.
-  #
-  # As a result, it is now possible to add migration files that are numbered
-  # lower than the current schema version: when migrating up, those
-  # never-applied "interleaved" migrations will be automatically applied, and
-  # when migrating down, never-applied "interleaved" migrations will be skipped.
-  #
   # == Timestamped Migrations
   #
   # By default, Rails generates migrations that look like:
diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb
index 2001a89ffb..6020aa238f 100644
--- a/activerecord/lib/active_record/relation/finder_methods.rb
+++ b/activerecord/lib/active_record/relation/finder_methods.rb
@@ -46,7 +46,7 @@ module ActiveRecord
     #   # returns the first item or returns a new instance (requires you call .save to persist against the database).
     #
     #   Person.where(name: 'Spartacus', rating: 4).first_or_create
-    #   # returns the first item or creates it and returns it, available since Rails 3.2.1.
+    #   # returns the first item or creates it and returns it.
     #
     # ==== Alternatives for +find+
     #
@@ -57,10 +57,10 @@ module ActiveRecord
     #   # returns a chainable list of instances with only the mentioned fields.
     #
     #   Person.where(name: 'Spartacus', rating: 4).ids
-    #   # returns an Array of ids, available since Rails 3.2.1.
+    #   # returns an Array of ids.
     #
     #   Person.where(name: 'Spartacus', rating: 4).pluck(:field1, :field2)
-    #   # returns an Array of the required fields, available since Rails 3.1.
+    #   # returns an Array of the required fields.
     def find(*args)
       if block_given?
         to_a.find(*args) { |*block_args| yield(*block_args) }