Add :nodoc: to `StatementPool` which is internal used [ci skip]

In #30510, `StatementPool` in `AbstractMysqlAdapter` was hidden in the
doc. But that class is also had in sqlite3 and postgresql adapters and
the base class is :nodoc: class.

1 files changed, 1 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
index 670afa3684..daece2bffd 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
@@ -90,9 +90,8 @@ module ActiveRecord
       #   Rails.application.config.active_record.sqlite3.represent_boolean_as_integer = true
       class_attribute :represent_boolean_as_integer, default: false
 
-      class StatementPool < ConnectionAdapters::StatementPool
+      class StatementPool < ConnectionAdapters::StatementPool # :nodoc:
         private
-
           def dealloc(stmt)
             stmt[:stmt].close unless stmt[:stmt].closed?
           end