Fix a documentation editing error.
diff --git a/doc/jemalloc.xml.in b/doc/jemalloc.xml.in
index 26a5e14..519ba3f 100644
--- a/doc/jemalloc.xml.in
+++ b/doc/jemalloc.xml.in
@@ -1467,7 +1467,7 @@
<listitem><para>Flush the specified thread-specific cache (tcache). The
same considerations apply to this interface as to <link
linkend="thread.tcache.flush"><mallctl>thread.tcache.flush</mallctl></link>,
- except that the tcache will never be automatically be discarded.
+ except that the tcache will never be automatically discarded.
</para></listitem>
</varlistentry>
