Fix Typo in Required Colections

Introduction.tex

@@ -68,7 +68,7 @@ The following process can be followed to select the collections required the res
   \item Then choose Installation Collections.%
 \begin{itemize}
     \item[-] Remove any languages you do not need.
-    \item[-] Remove ``ConTex'', ``MetaPost'', ``XeTeX''
+    \item[-] Remove ``ConTeXt'', ``MetaPost'', ``XeTeX''
     \item[-] Add ``LaTex Additional Packages'', ``Graphics, Pictures, Diagrams''
   \end{itemize}
   \item The installation of ``TeXworks editor'' is optional