Minor fixes and corrections to tutorial formatting.

doc/tutorial/source/conceptual-overview.rst

@@ -313,7 +313,7 @@ section, so go ahead and expand that documentation node.  Now, expand the
 ``Debugging`` book and then select the ``Logging`` page.
 
 You should now be looking at the Doxygen documentation for the Logging module.
-In the list of ``#define``s at the top of the page you will see the entry
+In the list of ``#define`` s at the top of the page you will see the entry
 for ``NS_LOG_COMPONENT_DEFINE``.  Before jumping in, it would probably be 
 good to look for the "Detailed Description" of the logging module to get a 
 feel for the overall operation.  You can either scroll down or select the

doc/tutorial/source/getting-started.rst

@@ -53,6 +53,7 @@ that approach, you can get a copy of ``ns-3-allinone`` by typing the
 following into your Linux shell (assuming you have installed Mercurial):
 
 ::
+
   cd
   mkdir repos
   cd repos
@@ -220,7 +221,7 @@ have to pick a release, download it and decompress it.
 As mentioned above, one practice is to create a directory called ``repos``
 in one's home directory under which one can keep local Mercurial repositories.
 One could also keep a ``tarballs`` directory.  *Hint:  the tutorial
-will assume you downloaded into a ``repos`` directory, so remember the
+will assume you downloaded into a* ``repos`` *directory, so remember the
 placekeeper.*  If you adopt the ``tarballs`` directory approach, you can 
 get a copy of a release by typing the following into your Linux shell 
 (substitute the appropriate version numbers, of course):

doc/tutorial/source/tracing.rst

@@ -2342,7 +2342,7 @@ must implement a single virtual method inherited from this class.
 
 The signature of this method reflects the device-centric view of the situation
 at this level.  All of the public methods inherited from class 
-2``PcapUserHelperForDevice`` reduce to calling this single device-dependent
+``PcapUserHelperForDevice`` reduce to calling this single device-dependent
 implementation method.  For example, the lowest level pcap method,
 
 ::