Update hooks.rst

Added 'to be' where needed

Author: tomolimo

source/plugins/hooks.rst

@@ -477,7 +477,7 @@ Hooks that permits to add display on items.
 
 ``timeline_actions``
    .. versionadded:: 9.4.1
-   .. versionchanged:: 10.0.0 The timeline action buttons were moved to the timeline footer. Some previous actions may no longer be compatible with the new timeline and will need adjusted.
+   .. versionchanged:: 10.0.0 The timeline action buttons were moved to the timeline footer. Some previous actions may no longer be compatible with the new timeline and will need to be adjusted.
 
    Display new actions in the ITIL object's timeline