mount.2: Remove crufty sentence about MS_BIND + MS_REMOUNT

This sentence is left over from an earlier rewrite of the text,
and the relevant details are covered a few paragraphs later.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
diff --git a/man2/mount.2 b/man2/mount.2
index de0ff0e..6f7f80d 100644
--- a/man2/mount.2
+++ b/man2/mount.2
@@ -327,10 +327,6 @@
 arguments should match the values used in the original
 .BR mount ()
 call, except for those parameters that are being deliberately changed.
-Another exception is that
-.B MS_BIND
-has a different meaning for remount, and it should be included only if
-explicitly desired.
 .PP
 The following
 .I mountflags