Specify that incident response is in hour

Add the text "(in hour)" in the Incident priority levels paragraph.

Author: venusbb

source/docs/guidance/technical-incident-management-guidance.html.md.erb

@@ -68,7 +68,7 @@ Use the impact and urgency matrix to set a priority level (P1 to P6). This makes
 
 ## **3\. Incident priority levels**
 
-This table defines the priority levels (P1 to P6) for internal services.
+This table defines the priority levels (P1 to P6) for internal services (In hour).
 
 | Priority Level | Definition (Internal Context) | Expected Response | Expected Resolution Target |
 | :---- | :---- | :---- | :---- |