Fix StatementCache docs format [ci skip]
Fix links containing stray colons
minor edit on StatementCache documentation [ci skip]
Update to Ryan's new book per his suggestion

See https://github.com/lifo/docrails/commit/edeb98c2745cbf29725eca87332cefb4f273986a#commitcomment-2995521
Fix a typo
fix :nodoc: mark on AR::AttributeMethods::Serialization [ci skip]
remove unused variable
Merge pull request #10201 from vipulnsward/remove_unused_var_in_guides

remove unused variable
hides the per thread registry instance, and caches singleton methods

Existing code was delegating to the instance with delegate
macro calls, or invoking the instance method to reach
the object and call its instance methods.

But the point is to have a clean class-level interface where
the thread local instance is hidden in the implementation.

References #11c6973.
References #10198.
update git links
Merge pull request #10204 from shmatov/update-git-links

Update github links
Corrected paramter to parameter
Add :nodoc: mark to PerThreadRegistry#method_missing [ci skip]
Merge pull request #10206 from epiclabs/nodoc_for_missing_method

Add :nodoc: mark to PerThreadRegistry#method_missing [ci skip]
use define_singleton_method instead of class_eval
Merge pull request #10207 from epiclabs/use_define_singleton_method

use define_singleton_method instead of class_eval
Merge branch 'master' of github.com:lifo/docrails
Document collection.create! on has_many associations in ActiveRecord
Merge pull request #10212 from mariovisic/active_record_doc

Add documentation for `collection.create!` on has_many records. [ci skip]