Fixes things mentioned by @samsonasik

Author: harikt

doc/book/container/aura-di.md

@@ -18,7 +18,7 @@ injection container with the following features:
 
 ## Installing Aura.Di
 
-Aura.Di v3 only implement [container-interop](https://github.com/container-interop/container-interop).
+Aura.Di v3 only implements [container-interop](https://github.com/container-interop/container-interop).
 
 ```bash
 $ composer require "aura/di:3.0.*@beta"

doc/book/container/bookdown.json

@@ -4,7 +4,7 @@
         {"Introduction": "intro.md"},
         {"Container Factories": "factories.md"},
         {"Using zend-servicemanager": "zend-servicemanager.md"},
-        {"Using Pimple": "pimple.md"}
+        {"Using Pimple": "pimple.md"},
         {"Using Aura.Di": "aura-di.md"}
     ]
 }