Clarified GPU description.

source/service_offerings.rst

@@ -294,19 +294,22 @@ To create a new compute offering:
       possible. Otherwise, the VM can be deployed in shared
       infrastructure.
 
-   -  **GPU**: Specify the card you want to use.
+   -  **GPU**: Assign a physical GPU(GPU-passthrough) or a portion of a physicalGPU
+       GPU card(vGPU) to the guest VM. It allows graphical applications to run on the VM. 
+       Select the card from the supported list of cards.
 
       The options given are NVIDIA GRID K1 and NVIDIA GRID K2. These are vGPU
       capable cards that allow multiple vGPUs on a single physical GPU. If you
-      want to use a card other than these, make the createServiceOffering API call.
+      want to use a card other than these, follow the instructions in the
+      **"GPU and vGPU support for CloudStack Guest VMs"** page in the 
+      Cloudstack Version 4.4 Design Docs found in the Cloudstack Wiki.
 
    -  **vGPU Type**: Represents the type of virtual GPU to be assigned to a
       guest VM. In this case, only a portion of a physical GPU card (vGPU) is
-      assigned to the guest VM. The available options includes GRID K100, K140Q,
-      K200 and so on.
+      assigned to the guest VM.
 
-      Additionally, passthrough vGPU type is defined to represet a physical GPU
-      device. A passthrough vGPU can directly be assigned to a single guest VM.
+      Additionally, the **passthrough vGPU** type is defined to represent a physical GPU
+      device. A **passthrough vGPU** can directly be assigned to a single guest VM.
       In this case, a physical GPU device is exclusively allotted to a single
       guest VM.