Fix a comment regarding --ide=json builder

Change-Id: I52b5d7d52bff21b90586b78326275a3b0b3424e2
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/8600
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>

src/gn/json_project_writer.cc

diff --git a/src/gn/json_project_writer.cc b/src/gn/json_project_writer.cc
index 0884aa7..a8f9ac4 100644
--- a/src/gn/json_project_writer.cc
+++ b/src/gn/json_project_writer.cc
@@ -28,14 +28,14 @@
 
 // Structure of JSON output file
 // {
-//   "build_settings" = {
+//   "build_settings" : {
 //     "root_path" : "absolute path of project root",
 //     "build_dir" : "build directory (project relative)",
 //     "default_toolchain" : "name of default toolchain"
 //   }
-//   "targets" = {
-//      "target x name" : { target x properties },
-//      "target y name" : { target y properties },
+//   "targets" : {
+//      "target x full label" : { target x properties },
+//      "target y full label" : { target y properties },
 //      ...
 //    }
 // }