Roll GN to 239533d

This caused gn format to flag many things which were also fixed.

Change-Id: Ie1d9081a1b08047bec52c60f54d2a94366be1ba6
diff --git a/pw_cpu_exception/BUILD.gn b/pw_cpu_exception/BUILD.gn
index 580e655..bec142e 100644
--- a/pw_cpu_exception/BUILD.gn
+++ b/pw_cpu_exception/BUILD.gn
@@ -27,13 +27,9 @@
     "$dir_pw_span",
     "$dir_pw_string",
   ]
-  public = [
-    "public/pw_cpu_exception/cpu_exception.h",
-  ]
+  public = [ "public/pw_cpu_exception/cpu_exception.h" ]
 }
 
 pw_doc_group("docs") {
-  sources = [
-    "docs.rst",
-  ]
+  sources = [ "docs.rst" ]
 }