Minor English grammar correction

Doc/ref/ref5.tex

@@ -971,7 +971,7 @@ Lambda forms (lambda expressions) have the same syntactic position as
 expressions.  They are a shorthand to create anonymous functions; the
 expression \code{lambda \var{arguments}: \var{expression}}
 yields a function object.  The unnamed object behaves like a function
-object define with
+object defined with
 
 \begin{verbatim}
 def name(arguments):