doc: Forgot to add CK_RHS_HASH

doc/CK_RHS_HASH

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+.\"
+.\" Copyright 2012-2013 Samy Al Bahra.
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+.Dd March 28, 2012
+.Dt CK_RHS_HASH 3
+.Sh NAME
+.Nm CK_RHS_HASH
+.Nd invoke hash function with hash set seed
+.Sh LIBRARY
+Concurrency Kit (libck, \-lck)
+.Sh SYNOPSIS
+.In ck_rhs.h
+.Ft unsigned long
+.Fn CK_RHS_HASH "ck_rhs_t *hs" "ck_rhs_hash_cb_t *hf" "const void *key"
+.Sh DESCRIPTION
+The
+.Fn CK_RHS_HASH 3
+macro will invoke the hash function pointed to by the
+.Fa hf
+argument with the seed value associated with
+.Fa hs
+and the key pointer specified by the
+.Fa key
+argument.
+.Sh RETURN VALUES
+This function will return the value returned by the
+.Fa hf
+function.
+.Sh ERRORS
+It is expected
+.Fa hs
+was previously initialized via
+.Fn ck_rhs_init 3 .
+.Sh SEE ALSO
+.Xr ck_rhs_init 3 ,
+.Xr ck_rhs_destroy 3 ,
+.Xr ck_rhs_iterator_init 3 ,
+.Xr ck_rhs_next 3 ,
+.Xr ck_rhs_get 3 ,
+.Xr ck_rhs_put 3 ,
+.Xr ck_rhs_set 3 ,
+.Xr ck_rhs_remove 3 ,
+.Xr ck_rhs_grow 3 ,
+.Xr ck_rhs_count 3 ,
+.Xr ck_rhs_reset 3 ,
+.Xr ck_rhs_stat 3
+.Pp
+Additional information available at http://concurrencykit.org/