docs : apply blockquote syntax to ZenDNN docs

Author: z-vishal

docs/backend/ZenDNN.md

@@ -1,8 +1,9 @@
 # llama.cpp for AMD ZenDNN
 
+> [!WARNING]
 > **Note:** ZenDNN is **not** the same as zDNN.
 > - **ZenDNN** (this page): AMD's deep learning library for AMD EPYC CPUs
-> - **zDNN**: IBM's library for IBM Z mainframe processors ([see zDNN documentation](zDNN.md))
+> - **zDNN**: IBM's Deep Neural Network acceleration library for IBM Z & LinuxONE Mainframes ([see zDNN documentation](zDNN.md))
 
 - [Background](#background)
 - [OS](#os)

docs/backend/zDNN.md

@@ -1,7 +1,8 @@
 # llama.cpp for IBM zDNN Accelerator
 
+> [!WARNING]
 > **Note:** zDNN is **not** the same as ZenDNN.
-> - **zDNN** (this page): IBM's library for IBM Z mainframe processors
+> - **zDNN** (this page): IBM's Deep Neural Network acceleration library for IBM Z & LinuxONE Mainframes
 > - **ZenDNN**: AMD's deep learning library for AMD EPYC CPUs ([see ZenDNN documentation](ZenDNN.md))
 
 ## Background