Make interactive_usage a bit more rst friendly

All paragraphs are correctly aligned so that it can be shown
in rst viewers without problems.

IPython/core/usage.py

@@ -74,6 +74,7 b" At your system command line, type 'ipython -h' to see the command line"
 options available. This document only describes interactive features.
 
 MAIN FEATURES
+-------------
 
 * Access to the standard Python help. As of Python 2.1, a help system is
   available with access to object docstrings and the Python manuals. Simply
@@ -116,13 +117,13 b' MAIN FEATURES'
 * Search previous command history in two ways (also requires readline):
 
   - Start typing, and then use Ctrl-p (previous,up) and Ctrl-n (next,down) to
-  search through only the history items that match what you've typed so
-  far. If you use Ctrl-p/Ctrl-n at a blank prompt, they just behave like
-  normal arrow keys.
+    search through only the history items that match what you've typed so
+    far. If you use Ctrl-p/Ctrl-n at a blank prompt, they just behave like
+    normal arrow keys.
 
   - Hit Ctrl-r: opens a search prompt. Begin typing and the system searches
-  your history for lines that match what you've typed so far, completing as
-  much as it can.
+    your history for lines that match what you've typed so far, completing as
+    much as it can.
 
   - %hist: search history by index (this does *not* require readline).
 
@@ -189,52 +190,68 b' MAIN FEATURES'
 
 * Auto-parentheses and auto-quotes (adapted from Nathan Gray's LazyPython)
 
-    1. Auto-parentheses
-        Callable objects (i.e. functions, methods, etc) can be invoked like
-        this (notice the commas between the arguments):
-            In [1]: callable_ob arg1, arg2, arg3
-        and the input will be translated to this:
-            ------> callable_ob(arg1, arg2, arg3)
-        This feature is off by default (in rare cases it can produce
-        undesirable side-effects), but you can activate it at the command-line
-        by starting IPython with `--autocall 1`, set it permanently in your
-        configuration file, or turn on at runtime with `%autocall 1`.
-
-        You can force auto-parentheses by using '/' as the first character
-        of a line.  For example:
-            In [1]: /globals             # becomes 'globals()'
-        Note that the '/' MUST be the first character on the line!  This
-        won't work:
-            In [2]: print /globals    # syntax error
-
-        In most cases the automatic algorithm should work, so you should
-        rarely need to explicitly invoke /. One notable exception is if you
-        are trying to call a function with a list of tuples as arguments (the
-        parenthesis will confuse IPython):
-            In [1]: zip (1,2,3),(4,5,6)  # won't work
-        but this will work:
-            In [2]: /zip (1,2,3),(4,5,6)
-            ------> zip ((1,2,3),(4,5,6))
-            Out[2]= [(1, 4), (2, 5), (3, 6)]
-
-        IPython tells you that it has altered your command line by
-        displaying the new command line preceded by -->.  e.g.:
-            In [18]: callable list
-            -------> callable (list)
-
-    2. Auto-Quoting
-        You can force auto-quoting of a function's arguments by using ',' as
-        the first character of a line.  For example:
-            In [1]: ,my_function /home/me   # becomes my_function("/home/me")
-
-        If you use ';' instead, the whole argument is quoted as a single
-        string (while ',' splits on whitespace):
-            In [2]: ,my_function a b c   # becomes my_function("a","b","c")
-            In [3]: ;my_function a b c   # becomes my_function("a b c")
-
-        Note that the ',' MUST be the first character on the line!  This
-        won't work:
-            In [4]: x = ,my_function /home/me    # syntax error
+  1. Auto-parentheses
+        
+     Callable objects (i.e. functions, methods, etc) can be invoked like
+     this (notice the commas between the arguments)::
+       
+         In [1]: callable_ob arg1, arg2, arg3
+       
+     and the input will be translated to this::
+       
+         callable_ob(arg1, arg2, arg3)
+       
+     This feature is off by default (in rare cases it can produce
+     undesirable side-effects), but you can activate it at the command-line
+     by starting IPython with `--autocall 1`, set it permanently in your
+     configuration file, or turn on at runtime with `%autocall 1`.
+
+     You can force auto-parentheses by using '/' as the first character
+     of a line.  For example::
+       
+          In [1]: /globals             # becomes 'globals()'
+       
+     Note that the '/' MUST be the first character on the line!  This
+     won't work::
+       
+          In [2]: print /globals    # syntax error
+
+     In most cases the automatic algorithm should work, so you should
+     rarely need to explicitly invoke /. One notable exception is if you
+     are trying to call a function with a list of tuples as arguments (the
+     parenthesis will confuse IPython)::
+       
+          In [1]: zip (1,2,3),(4,5,6)  # won't work
+       
+     but this will work::
+       
+          In [2]: /zip (1,2,3),(4,5,6)
+          ------> zip ((1,2,3),(4,5,6))
+          Out[2]= [(1, 4), (2, 5), (3, 6)]
+
+     IPython tells you that it has altered your command line by
+     displaying the new command line preceded by -->.  e.g.::
+       
+          In [18]: callable list
+          -------> callable (list)
+
+  2. Auto-Quoting
+    
+     You can force auto-quoting of a function's arguments by using ',' as
+     the first character of a line.  For example::
+       
+          In [1]: ,my_function /home/me   # becomes my_function("/home/me")
+
+     If you use ';' instead, the whole argument is quoted as a single
+     string (while ',' splits on whitespace)::
+       
+          In [2]: ,my_function a b c   # becomes my_function("a","b","c")
+          In [3]: ;my_function a b c   # becomes my_function("a b c")
+
+     Note that the ',' MUST be the first character on the line!  This
+     won't work::
+       
+          In [4]: x = ,my_function /home/me    # syntax error
 """
 
 interactive_usage_min =  """\