* removed stray bracket

docs/dos.tex

@@ -141,7 +141,7 @@ The size of the \var{name} field is 255 under \linux.
         2 : (eax,  ebx,  ecx,  edx,  ebp,  esi,  edi : longint);
         End;
 \end{verbatim}
-The  \var{registers} type is used in the var{\var{MSDos} call.
+The  \var{registers} type is used in the \var{MSDos} call.
 \begin{verbatim}
   DateTime = record
     Year: Word;