fix a bunch of spelling errors
(closes SF patch #1104868)
diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex
index 746615e..24ed4ac 100644
--- a/Doc/ref/ref5.tex
+++ b/Doc/ref/ref5.tex
@@ -960,7 +960,7 @@
object is a member of a set if the set is a sequence and contains an
element equal to that object. However, it is possible for an object
to support membership tests without being a sequence. In particular,
-dictionaries support memership testing as a nicer way of spelling
+dictionaries support membership testing as a nicer way of spelling
\code{\var{key} in \var{dict}}; other mapping types may follow suit.
For the list and tuple types, \code{\var{x} in \var{y}} is true if and