Remove bogus \@.

Doc/lib/librgbimg.tex

@@ -45,5 +45,5 @@ These are the formats returned by \function{gl.lrectread()}.
 This function sets a global flag which defines whether the scan lines
 of the image are read or written from bottom to top (flag is zero,
 compatible with SGI GL) or from top to bottom(flag is one,
-compatible with X)\@.  The default is zero.
+compatible with X).  The default is zero.
 \end{funcdesc}