Remove non-informative "Supported optional features" section

The "Supported optional features" in the conformance submission
template does not add any useful information that is not already covered
by the rest of the document, so this patch proposes its removal.

Signed-off-by: Larsen, Steffen <steffen.larsen@intel.com>

Author: steffenlarsen

conformance/submission_details_template.txt

@@ -75,13 +75,6 @@ Environment requirements:
 # List of KHR extension supported by the SYCL implementation.
 # KHR extensions:
 
-# Supported optional features.
-#
-# List of optional features supported by the SYCL implementation, and the
-# backend/platform/device combninations for which they are supported.
-#
-Optional features:
-
 # Tests version.
 #
 # Commit SHA (full hash) of the commit which was used to run the tests.