pw_toolchain: Remove stale comment

Change-Id: I3c979a4cdd5a19f9a8a1e5a6cdbcdc57feb8693b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/60183
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
Reviewed-by: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pw_toolchain/static_analysis_toolchain.gni b/pw_toolchain/static_analysis_toolchain.gni
index ec228d3..f175642 100644
--- a/pw_toolchain/static_analysis_toolchain.gni
+++ b/pw_toolchain/static_analysis_toolchain.gni
@@ -36,7 +36,6 @@
 #   cc: (required) String indicating the C compiler to use.
 #   cxx: (required) String indicating the C++ compiler to use.
 template("pw_static_analysis_toolchain") {
-  # Determine OS of toolchain, which is the builtin argument "current_os".
   invoker_toolchain_args = invoker.defaults
 
   # Clang tidy is invoked by a wrapper script which implements the missing