Fix typo
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex
index f932683..b8256c3 100644
--- a/Doc/ref/ref3.tex
+++ b/Doc/ref/ref3.tex
@@ -910,7 +910,7 @@
\begin{methoddesc}[object]{__repr__}{self}
Called by the \function{repr()}\bifuncindex{repr} built-in function
and by string conversions (reverse quotes) to compute the ``official''
-string representation of an object. It at all possible, this should
+string representation of an object. If at all possible, this should
look like a valid Python expression that could be used to recreate an
object with the same value (given an appropriate environment). If
this is not possible, a string of the form \samp{<\var{...some useful