SWDEV-288929 - Update HIP documents

Change-Id: Ic633e6783162a1e697597a1e077d814c23ceaa07

docs/markdown/hip_programming_guide.md

@@ -45,6 +45,7 @@ else {
 . . .
 }
 ```
+Please note, the managed memory capability check may not be necessary, but if HMM is not supported, then managed malloc will fall back to using system memory and other managed memory API calls will have undefined behavior.
 For more details on managed memory APIs, please refer to the documentation HIP-API.pdf.
 
 ### HIP Stream Memory Operations