[gtkmm-documentation] Tiny whitespace correction.

[Murray Cumming <murrayc src gnome org>]

commit dd25ab294d3db3f396107f294df43b487a6cbeec
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Sep 9 17:15:33 2015 +0200

    Tiny whitespace correction.

 .../command_line_handling/exampleapplication.cc    |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/examples/book/application/command_line_handling/exampleapplication.cc 
b/examples/book/application/command_line_handling/exampleapplication.cc
index 40cb055..fbdc11a 100644
--- a/examples/book/application/command_line_handling/exampleapplication.cc
+++ b/examples/book/application/command_line_handling/exampleapplication.cc
@@ -174,7 +174,8 @@ int ExampleApplication::on_command_line(const Glib::RefPtr<Gio::ApplicationComma
     "  remaining =";
   for (std::size_t i = 0; i < vec_remaining.size(); ++i)
     std::cout << ' ' << vec_remaining[i];
-  std::cout << std::endl; 
+  std::cout << std::endl;
+
 
   if(vec_remaining.empty())
   {