Removed references to vtblockdirty.
Reference: /n/sources/patch/applied/man-2-venti-cache-vtblockdirty
Date: Sat May  7 22:58:36 CES 2011
Signed-off-by: djc@9grid.fr

--- /sys/man/2/venti-cache	Sat May  7 22:58:21 2011
+++ /sys/man/2/venti-cache	Sat May  7 22:58:18 2011
@@ -2,7 +2,6 @@
 .SH NAME
 VtBlock, VtCache, 
 vtblockcopy,
-vtblockdirty,
 vtblockduplock,
 vtblockput,
 vtblockwrite,
@@ -77,9 +76,6 @@
 .PP
 .B
 VtBlock*	vtblockcopy(VtBlock *b);
-.PP
-.B
-int	vtblockdirty(VtBlock *b);
 .SH DESCRIPTION
 These functions provide access to a simple in-memory
 cache of blocks already stored on a Venti server