Remove Param::return_type and argument_types

Co-authored-by: Greg Lueck <[email protected]>

Author: Pennycook

sycl/doc/extensions/proposed/sycl_ext_oneapi_launch_queries.asciidoc

@@ -122,7 +122,7 @@ namespace sycl {
 class kernel {
  public:
   template <typename Param, typename... T>
-  typename Param::return_type ext_oneapi_get_info(T... args) const;
+  /*return-type*/ ext_oneapi_get_info(T... args) const;
 };
 
 }
@@ -131,19 +131,18 @@ class kernel {
 [source,c++]
 ----
 template <typename Param, typename... T>
-typename Param::return_type ext_oneapi_get_info(T... args) const;
+/*return-type*/ ext_oneapi_get_info(T... args) const;
 ----
 _Constraints_: Available only when the types `+T...+` described by the parameter
-pack match the type list defined by `Param::argument_types`, which must be
-defined in accordance with the table below. The representation of
-`Param::argument_types` is unspecified.
+pack match the types defined in the table below.
 
 _Preconditions_: `Param` must be one of the `info::kernel` descriptors defined
 in this extension, and the type alias `Param::return_type` must be defined in
 accordance with the table below.
 
 _Returns_: Information about the kernel that applies when the kernel is
 submitted with the configuration described by the parameter pack `+T...+`.
+The return type is defined in the table below.
 
 This extension adds several new queries to this interface, many of which
 already have equivalents in the `kernel_device_specific` or `device`