org.texi (Column width and alignment): Make the example visually more clear

* org.texi (Column width and alignment): Make the example
visually more clear.

Thanks to Joost Helberg for suggesting this.

doc/org.texi

@@ -2271,7 +2271,7 @@ If you would like to overrule the automatic alignment of number-rich columns
 to the right and of string-rich column to the left, you can use @samp{<r>},
 @samp{<c>}@footnote{Centering does not work inside Emacs, but it does have an
 effect when exporting to HTML.} or @samp{<l>} in a similar fashion.  You may
-also combine alignment and field width like this: @samp{<l10>}.
+also combine alignment and field width like this: @samp{<r10>}.
 
 Lines which only contain these formatting cookies will be removed
 automatically when exporting the document.