Minor typo in fread.3

[Ryan T May]

I found a minor typo in the manpage for fread(3).

Thanks,
Ryan May

Index: fread.3
===================================================================
RCS file: /cvs/src/lib/libc/stdio/fread.3,v
retrieving revision 1.8
diff -u -r1.8 fread.3
--- fread.3     1 May 2014 16:40:36 -0000       1.8
+++ fread.3     5 Mar 2015 03:11:41 -0000
@@ -87,7 +87,7 @@
 If the product of
 .Fa size
 and
-.Fa nemb
+.Fa nmemb
 results in integer overflow, 0 is returned and errno
 is set to
 .Er EOVERFLOW .