Fixed some formatting issues in Chapter 2

Thanks to @kdavies4 for reporting this.  This closes #207.

Author: mtiller

text/source/behavior/discrete/decay.rst

@@ -267,7 +267,7 @@ to suppress events in some cases.  But one might reasonably ask, why
 not skip events and just evaluate conditional expressions all the
 time?  So let's take some time to explore this question and explain
 why, on the whole, associated events with conditional expressions is
-very good idea[#Belmon]_.
+very good idea [#Belmon]_.
 
 Without event detection, the integrator will simply step right over
 events.  When this happens, the integrator will miss important changes

text/source/behavior/discrete/events.rst

@@ -148,7 +148,7 @@ generators that trigger at regular intervals):
 ======================  ========================================================
 Function                 Description
 ----------------------  --------------------------------------------------------
-``Clock(i,r)``           A clock that fires every :math:`\frac{i}{r}` seconds where ``i`` and ``r`` are ``Integer``s
+``Clock(i,r)``           A clock that fires every :math:`\frac{i}{r}` seconds where ``i`` and ``r`` are both of type ``Integer``
 ``Clock(dt)``            A clock that fires every :math:`dt` seconds where ``dt`` is a ``Real``
 ``subSample(u,s)``       A clock that samples ``s`` times slower than the clock used to sample ``u`` where ``s`` is an ``Integer``
 ``superSample(u,s)``     A clock that samples ``s`` times faster than the clock used to sample ``u`` where ``s`` is an ``Integer``