re-apply some xhv_backreferences notes and stuff

re-apply some of the small doc fixes and a couple of minor code tweaks that
were part of the reverted commit 044d8c24fa9214cf0fe9c6fc8a44e03f3f5374d7,
but which didn't need reverting

1 files changed, 1 insertions, 1 deletions

diff --git a/hv.c b/hv.c
index bb803292ae..d7d6db1436 100644
--- a/hv.c
+++ b/hv.c
@@ -1722,7 +1722,7 @@ S_hfreeentries(pTHX_ HV *hv)
 	}
 
 	/* make everyone else think the array is empty, so that the destructors
-	 * called for freed entries can't recusively mess with us */
+	 * called for freed entries can't recursively mess with us */
 	HvARRAY(hv) = NULL;
 	((XPVHV*) SvANY(hv))->xhv_keys = 0;