Correct typo.

doc/musrSim.tex

@@ -1260,7 +1260,7 @@ The list of variables that can be stored in the Root tree:
 	If the track ID is negative, there were more than just one track contributing to this hit.  The absolute value
         of det\_VrtxTrackID[det\_n] corresponds to the first (in time) track.
 \item{\bf det\_VrtxParticleID[det\_n]} (array of Int\_t) -- particle ID of the first particle that belongs to the given hit.
-        (Some relevant particle IDs: Muun+=-13, Muon-=+13, Electron=11, Positron=-11,
+        (Some relevant particle IDs: Muon+=-13, Muon-=+13, Electron=11, Positron=-11,
         Gamma=22, Proton=2212, Neutron=2112, Pion-=-211, Pion+=211.)
 \item{\bf det\_Vvv*****[det\_n]} -- similar to the variables det\_Vrtx*****[det\_n] above, but if the first particle 
 	belonging to the hit was created inside of the logical volume where the hit occurs, then it's track is followed
@@ -1302,7 +1302,7 @@ The list of variables that can be stored in the Root tree:
         the given ``save'' volume.  Save volumes can therefore be made of vacuum.
 \item{\bf save\_detID[save\_n]} (array of Int\_t) --  ID number of the save volume.
 \item{\bf save\_particleID[save\_n]} (array of Int\_t) -- particle ID of the particle that entered the save volume.
-        (Some relevant particle IDs: Muun+=-13, Muon-=+13, Electron=11, Positron=-11,
+        (Some relevant particle IDs: Muon+=-13, Muon-=+13, Electron=11, Positron=-11,
         Gamma=22, Proton=2212, Neutron=2112, Pion-=-211, Pion+=211.)
 \item{\bf save\_time[save\_n]} (array of Double\_t) -- time when the particle entered in the volume (in $\mu$s).
 \item{\bf save\_x[save\_n], save\_y[save\_n], save\_z[save\_n]} (array of Double\_t) -- position of the particle where it