Improved grammar in boost compilation message.

dlib/add_python_module

@@ -71,11 +71,12 @@ if (NOT Boost_FOUND)
         message(" And then add the output bin folder to your PATH.  Usually this is the C:\\boost-build-engine\\bin")
         message(" folder. Finally, go to the boost root and run a command like this:")
         message("    b2 --with-python address-model=64 toolset=msvc --build-type=complete")
-        message(" And set the BOOST_LIBRARYDIR equal to wherever it puts the compiled libraries.")
+        message(" When it completes, set BOOST_LIBRARYDIR equal to wherever b2 put the compiled libraries.")
         message(" Note that you will need to set the address-model based on if you want a 32 or 64bit python library.")
-        message(" Similarly, when you invoke cmake you may have to use cmake's -G option to set the 64 vs. 32bit mode")
-        message(" of visual studio.  Also, if you want a Python3 library will also need to add -DPYTHON3=1.  You do ")
-        message(" this with a statement like: ")
+        message("")
+        message(" Next, when you invoke cmake to compile dlib you may have to use cmake's -G option to set the ")
+        message(" 64 vs. 32bit mode of visual studio.  Also, if you want a Python3 library you will need to ")
+        message(" add -DPYTHON3=1.  You do this with a statement like: ")
         message("    cmake -G \"Visual Studio 12 2013 Win64\" -DPYTHON3=1 ..\\..\\tools\\python")
         message(" Rather than:")
         message("    cmake ..\\..\\tools\\python")