MLECO-2036: Fix Vela3 documentation references & update Vela .ini configuration

Signed-off-by: George Gekov <george.gekov@arm.com>
Change-Id: I92b9ab60974ad266246994deae5833f7f374633d
diff --git a/source/use_case/asr/usecase.cmake b/source/use_case/asr/usecase.cmake
index 89014de..3417c06 100644
--- a/source/use_case/asr/usecase.cmake
+++ b/source/use_case/asr/usecase.cmake
@@ -71,7 +71,7 @@
 
 
 USER_OPTION(${use_case}_ACTIVATION_BUF_SZ "Activation buffer size for the chosen model"
-    0x00200000
+    0x00400000
     STRING)
 
 if (ETHOS_U55_ENABLED)