Remove mentions of host platform

Author: jchlanda

sycl/doc/extensions/experimental/sycl_ext_oneapi_get_unsupported_platforms.asciidoc

@@ -55,9 +55,8 @@ specification.*
 
 The implementation of `sycl::platform` already allows querying for supported
 platforms - `static std::vector<platform> get_platforms()` - which returns all
-available SYCL platforms in the system (the resulting vector always contains a
-single SYCL host platform instance). This extension adds an API entry to list
-all unsupported platforms; the platform is considered unsupported if it is
+available SYCL platforms in the system. This extension adds an API entry to
+list all unsupported platforms; the platform is considered unsupported if it is
 non-SYCL, or does not have any devices associated.
 
 This extension exists to solve a specific problem: listing of all platforms

sycl/source/detail/platform_impl.hpp

@@ -117,9 +117,8 @@ class platform_impl {
 
   /// Returns all available SYCL platforms in the system.
   ///
-  /// By default the resulting vector always contains a single SYCL host
-  /// platform instance. There are means to override this behavior for testing
-  /// purposes. See environment variables guide for up-to-date instructions.
+  /// There are means to override this behavior for testing purposes. See
+  /// environment variables guide for up-to-date instructions.
   ///
   /// \return a vector of all available SYCL platforms.
   static std::vector<platform> get_platforms();