move from experimental to proposed folder

Author: sherry-yuan

sycl/doc/extensions/experimental/sycl_ext_intel_runtime_buffer_location.asciidoc renamed to sycl/doc/extensions/proposed/sycl_ext_intel_runtime_buffer_location.asciidoc

@@ -38,13 +38,11 @@ references below to the "core SYCL specification" or to section numbers in the
 SYCL specification refer to that revision.
 
 == Status
-This is an experimental extension specification, intended to provide early
-access to features and gather community feedback.  Interfaces defined in this
-specification are implemented in {dpcpp}, but they are not finalized and may
-change incompatibly in future versions of {dpcpp} without prior notice.
-*Shipping software products should not rely on APIs defined in this
-specification.*
-
+This is a proposed extension specification, intended to gather community
+feedback.  Interfaces defined in this specification may not be implemented yet
+or may be in a preliminary state.  The specification itself may also change in
+incompatible ways before it is finalized.  *Shipping software products should
+not rely on APIs defined in this specification.*
 
 == Overview