minor changes

text_processing/ie_ner.tex

@@ -204,7 +204,7 @@ Example: NER system, developed for participation in MUC-6
 \item[\ra] recognizes \myemph{organisation}, \myemph{person}, \myemph{location} and \myemph{time} expressions in \textbf{newswire texts}
 \end{itemize}
 
-System has three main stages:
+System has four main stages:
 \begin{enumerate}
 \item Lexical processing
 \item NE parsing