typo

Doc/lib/libcodecs.tex

@@ -1080,7 +1080,7 @@ listed as operand type in the table.
 \lineiv{undefined}
          {}
          {any}
-         {Raise an exception for all conversion. Can be used as the
+         {Raise an exception for all conversions. Can be used as the
           system encoding if no automatic coercion between byte and
           Unicode strings is desired.}