Fix minor typo in Tutorial PDB example

Doc/Tutorial.tex

@@ -80,7 +80,7 @@
 
 \author{Jeff Chang, Brad Chapman, Iddo Friedberg, Thomas Hamelryck, \\
 Michiel de Hoon, Peter Cock, Tiago Antao, Eric Talevich, Bartek Wilczy\'{n}ski}
-\date{Last Update -- 2 March 2012 (Biopython 1.59+)}
+\date{Last Update -- 12 April 2012 (Biopython 1.59+)}
 
 %Hack to get the logo at the start of the HTML front page:
 %(hopefully this isn't going to be too wide for most people)
@@ -7597,7 +7597,7 @@ \subsection{Disordered atoms\label{disordered atoms}}
 a specific altloc identifier:
 
 \begin{verbatim}
-atom.disordered\_select("A")		# select altloc A atom
+atom.disordered_select("A")		# select altloc A atom
 
 print atom.get_altloc()
 "A"