Use future passive tense for vision

The features we are talking about are not currently fully functional.
Make sure that readers understand that.

Signed-off-by: Amit Kucheria <amit.kucheria.ext@huawei.com>

overview/openharmony-vision.rst

@@ -97,8 +97,8 @@ the target device class and its HW constraints.
 Application Layer
 -----------------
 
-This Application layer consists of system and third-party applications.
-|main_project_name| applications will be able to use APIs to expose business
-logic as `abilities` that may be utilized inside other applications, thus
+When completed, the Application layer will host the system and third-party
+applications. |main_project_name| applications will be able to use APIs to expose
+business logic as `abilities` that may be utilized inside other applications, thus
 allowing creation of more integrated experiences on the same device as well as
 distributed across devices.