Changed $objectName to $objectType for consistency

Examples and explanations on this page use $objectType, so standardizing on that.

docs/hooks/hook_civicrm_searchTasks.md

@@ -7,11 +7,11 @@ search, allowing you to inject additional actions or to remove existing actions.
 
 ## Definition
 
-    hook_civicrm_searchTasks( $objectName, &$tasks )
+    hook_civicrm_searchTasks( $objectType, &$tasks )
 
 ## Parameters
 
--   $objectName - the object for this search - activity, campaign,
+-   $objectType - the object for this search - activity, campaign,
     case, contact, contribution, event, grant, membership, and pledge
     are supported.
 -   $tasks - the current set of tasks for that custom field. You can
@@ -44,4 +44,4 @@ search, allowing you to inject additional actions or to remove existing actions.
                 unset($tasks[1]);
             }
         }
-    }
\ No newline at end of file
+    }