fixed what made pdf gen crash

doc/basic_tutorial/module.txt

@@ -156,9 +156,6 @@ Using Inheritance
 A friendlier way to use Module is to implement your functionality as a
 subclass of Module:
 
-
-.. code-block:: python
-
 .. literalinclude:: ../examples/module/accumulator.py
 
 This is just like the previous example except slightly fancier.

doc/basic_tutorial/tools.txt

@@ -8,14 +8,14 @@ Basic Tutorial Mini-Reference
 Mode
 ====
 
-============= ==============================================================   ===============================================================================
+============= =========================================================== ===============================================================================
 short name    Full constructor                                            What does it do?
-============= ==============================================================   ===============================================================================
--             ``compile.mode.Mode(linker='py', optimizer=None)``                Python implementations with zero graph modifications.
-FAST_COMPILE  ``compile.mode.Mode(linker='c|py', optimizer='fast_compile')      C implementations where available, quick and cheap graph transformations
-FAST_RUN      ``compile.mode.Mode(linker='c|py', optimizer='fast_run')          C implementations where available, all available graph transformations.
-DEBUG_MODE    ``compile.debugmode.DebugMode()                                   Both implementations where available, all available graph transformations.
-============= ==============================================================   ===============================================================================
+============= =========================================================== ===============================================================================
+(default)     compile.mode.Mode(linker='py', optimizer=None)              Python implementations with zero graph modifications.
+FAST_COMPILE  compile.mode.Mode(linker='c|py', optimizer='fast_compile')  C implementations where available, quick and cheap graph transformations
+FAST_RUN      compile.mode.Mode(linker='c|py', optimizer='fast_run')      C implementations where available, all available graph transformations.
+DEBUG_MODE    compile.debugmode.DebugMode()                               Both implementations where available, all available graph transformations.
+============= =========================================================== ===============================================================================
 
 .. _tensortypes: