Update docs for container-interop -> PSR-11 change

Removed the PSR-11 book page since it no longer applies, but I imagine
there will be some migration docs to take their place before this is
would be released.

Author: michaelmoussa

docs/book/migration.md

@@ -251,7 +251,7 @@ $container->mapLazyService('MyClass');
 ## ServiceLocatorInterface Changes
 
 The `ServiceLocatorInterface` now extends the
-[container-interop](https://github.com/container-interop/container-interop)
+[Psr\Container\ContainerInterface](https://github.com/php-fig/container)
 interface `ContainerInterface`, which defines the same `get()` and `has()`
 methods as were previously defined.
 

docs/book/psr-11.md

@@ -3,7 +3,7 @@
 The Service Manager is a modern, fast, and easy-to-use implementation of the
 [Service Locator design pattern](https://en.wikipedia.org/wiki/Service_locator_pattern).
 The implementation implements the
-[Container Interop](https://github.com/container-interop/container-interop)
+[Psr\Container\ContainerInterface](https://github.com/psr/container)
 interfaces, providing interoperability with other implementations.
 
 The following is a "quick start" tutorial intended to get you up and running

docs/book/quick-start.md

@@ -4,7 +4,6 @@ pages:
     - index.md
     - 'Quick Start': quick-start.md
     - Reference:
-      - 'PSR-11 Support': psr-11.md
       - 'Configuring the service manager': configuring-the-service-manager.md
       - Delegators: delegators.md
       - 'Lazy services': lazy-services.md