Fixing comments

Fixing some of the comments in DefaultSettings.cmake and
PlatformInfo.cmake.

I haven't added any vendor cache files yet, so the comment doesn't point
anywhere. Also fixing the reference to the location of the clang
resource headers in PlatformInfo.cmake.

Author: etcwilde

Runtimes/Core/cmake/modules/DefaultSettings.cmake

@@ -1,8 +1,7 @@
 # This file is designed to setup reasonable defaults for the various settings so
 # that configuring a build for a given platform is likely to build
 # out-of-the-box without customization. This does not mean that it is the only
-# way that will work. The config files under `cmake/configs` are build
-# configurations that are actually shipping.
+# way that will work, or that it represents a shipping configuration.
 
 set(SwiftCore_ENABLE_BACKTRACING_default OFF) # TODO: enable this by default
 set(SwiftCore_ENABLE_COMMANDLINE_SUPPORT_default OFF) # TODO: enable this by default

Runtimes/Core/cmake/modules/PlatformInfo.cmake

@@ -21,7 +21,7 @@ endif()
 if(NOT SwiftCore_SWIFTC_CLANGIMPORTER_RESOURCE_DIR)
   # TODO: We need to separate the concept of compiler resources and the stdlib.
   #       Compiler-resources in the compiler-resource directory are specific to
-  #       a given compiler. The headers in `lib/clang/include` and
+  #       a given compiler. The headers in `lib/clang/<version>/include` and
   #       `lib/swift/clang/include` correspond with that specific copy clang and
   #       should not be mixed. This won't cause modularization issues because
   #       the one copy of clang should never be looking in the other's resource