collected man section 2 updates

Reference: /n/atom/patch/applied2013/man2upd
Date: Thu Jun 20 01:45:22 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/man/2/9pfile	Thu Jun 20 01:45:06 2013
+++ /sys/man/2/9pfile	Thu Jun 20 01:45:06 2013
@@ -85,7 +85,13 @@
 .I name
 in the directory
 .IR dir .
-If created, the file will have owner
+After successfully creating a file the new file
+will have two references, one for the caller and
+one for the tree.  The caller should call
+.I closefile
+when it is done with the file pointer to
+maintain an accurate reference count.
+The file will have owner
 .I uid 
 and have a group inherited from
 the directory.
--- /sys/man/2/muldiv	Thu Jun 20 01:45:06 2013
+++ /sys/man/2/muldiv	Thu Jun 20 01:45:06 2013
@@ -28,8 +28,4 @@
 .B long
 or
 .BR ulong ;
-on others
-.IR abort (2)
-is called to avoid slient truncation.
-.SH SOURCE
-.B /sys/src/libc/port
+on others they will silently truncate.