gn desc: printing public_deps without --all and --tree

tools/gn/command_desc.cc

Index: tools/gn/command_desc.cc
diff --git a/tools/gn/command_desc.cc b/tools/gn/command_desc.cc
index 8dbe6de7de932ec9b67c7cf2219cc6acbf6b8293..41b6aaded44e1d9529d4e4b0c139c3aefa706272 100644
--- a/tools/gn/command_desc.cc
+++ b/tools/gn/command_desc.cc
@@ -372,8 +372,13 @@ Printing outputs
 
 Printing deps
 
-  Deps will include all public, private, and data deps (TODO this could be
-  clarified and enhanced) sorted in order applying. The following may be used:
+  Deps could include public, private and data deps.
+
+  If the command is invoked with --tree or --all, deps will include all public,
+  private and data deps. If the command is invoked without --tree and --all deps
+  will only include private and data deps. In this case public deps will be
+  printed as part of the section "public_deps". Deps will be sorted in order
+  applying. The following may be used:
 
   --all
       Collects all recursive dependencies and prints a sorted flat list. Also