Add versionadded. Remove duplicate "to"

nnorwitz · nnorwitz · commit a4d2b869b9d5 · 2003-07-09T12:41:55.000Z
diff --git a/Doc/lib/libthread.tex b/Doc/lib/libthread.tex
@@ -45,7 +45,8 @@ \section{\module{thread} ---
 
 \begin{funcdesc}{interrupt_main}{}
 Raise a KeyboardInterrupt in the main thread.  A subthread can use this
-function to to interrupt the main thread.
+function to interrupt the main thread.
+\versionadded{2.3}
 \end{funcdesc}
 
 \begin{funcdesc}{exit}{}
