updated and addressed peer review comments on tutorials API

src/content/docs/backend/API/tutorials.md

@@ -42,7 +42,7 @@ DELETE /api/tutorials/{id}
         true
     ```
 -----------------------------------------------------------------------------
-### PUT: Create a tutorial
+### PUT: Update a tutorial
 PUT /api/tutorials/{id}
 
 - URL: `/api/tutorials/{id}`
@@ -110,13 +110,13 @@ POST /api/tutorials
 
 
 - Response: 
-        `201 Created`
+        `201 Created`: Tutorial added successfully.
 
 - Example Request:
     ```bash
     curl -X POST --header 'Content-Type: application/x-www-form-urlencoded' --header 'Accept: application/json' --header 'Username: aadmin' --header 'Auth_Token: 3DLo9xQoiKbXb7-ViNzJ' -d 'tutorial%5Bunit_id%5D=1&tutorial%5Btutor_id%5D=43&tutorial%5Bcapacity%5D=45&tutorial%5Babbreviation%5D=tut_test2&tutorial%5Bmeeting_location%5D=online&tutorial%5Bmeeting_day%5D=Tue&tutorial%5Bmeeting_time%5D=11%3A00' 'http://localhost:3000/api/tutorials'
     ```
 - Response body: 
     ```
-        null
+        Tutorial added successfully.
     ```