Doxy comments

Add some missing doxygen comments

Change-Id: Ic5d6684d90f5b2fe9ed3914bbb7c4058effc040c
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/29500
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>

src/inspector.h

diff --git a/src/inspector.h b/src/inspector.h
index f20bf42..db42b41 100644
--- a/src/inspector.h
+++ b/src/inspector.h
@@ -31,9 +31,11 @@
   std::string name;
   /// The entry point stage
   ast::PipelineStage stage = ast::PipelineStage::kNone;
-  /// Elements of the workgroup size tuple
+  /// The workgroup x size
   uint32_t workgroup_size_x;
+  /// The workgroup y size
   uint32_t workgroup_size_y;
+  /// The workgroup z size
   uint32_t workgroup_size_z;
 
   /// @returns the size of the workgroup in {x,y,z} format