Fix small grammatical mistake.

Doc/lib/libfuncs.tex

@@ -143,7 +143,7 @@ class C:
   sequence of statements, \code{'eval'} if it consists of a single
   expression, or \code{'single'} if it consists of a single
   interactive statement (in the latter case, expression statements
-  that evaluate to something else than \code{None} will printed).
+  that evaluate to something else than \code{None} will be printed).
 
   When compiling multi-line statements, two caveats apply: line
   endings must be represented by a single newline character