Update sarif_mapper.md

Update with correct mapping for impact values.

Author: Bialogs

lib/heimdall_tools/help/sarif_mapper.md

@@ -4,8 +4,8 @@ SARIF level to HDF impact Mapping:
   SARIF level error -> HDF impact 0.7
   SARIF level warning -> HDF impact 0.5
   SARIF level note -> HDF impact 0.3
-  SARIF level none -> HDF impact 0.0
-  SARIF level not provided -> HDF impact 0.5 as default
+  SARIF level none -> HDF impact 0.1
+  SARIF level not provided -> HDF impact 0.1 as default
 
 Examples: