Fixed typo.

janpgit · janpgit · commit dc261cda265f · 2018-02-01T22:29:15.000+01:00
diff --git a/intro.tex b/intro.tex
@@ -1371,7 +1371,7 @@
 versions from those that the programs were initially built with.  Quite often
 this might be hard to find when something goes bad and you start seeing
 unexpected behavior.  Commands like \texttt{pldd} come in handy in such
-situation.
+situations.
 \end{itemize}
 
 %%%%%
