Roll GN to 239533d

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

Change-Id: Ie1d9081a1b08047bec52c60f54d2a94366be1ba6
diff --git a/pw_doctor/BUILD.gn b/pw_doctor/BUILD.gn
index 9eed4a2..57493ab 100644
--- a/pw_doctor/BUILD.gn
+++ b/pw_doctor/BUILD.gn
@@ -15,7 +15,5 @@
 import("$dir_pw_docgen/docs.gni")
 
 pw_doc_group("docs") {
-  sources = [
-    "docs.rst",
-  ]
+  sources = [ "docs.rst" ]
 }