docs: fix stale sed line range in receive quorum docs

Update the sed range in docs/components/receive.md from '1068,1078p'
to '1067,1078p' to match the current line numbers in handler.go after
upstream changes shifted the writeQuorum function.

Signed-off-by: Kc Balusu <kcbalusu@meta.com>

Author: Krishnachaitanyakc

docs/components/receive.md

@@ -372,7 +372,7 @@ Please see the metric `thanos_receive_forward_delay_seconds` to see if you need
 
 The following formula is used for calculating quorum:
 
-```go mdox-exec="sed -n '1068,1078p' pkg/receive/handler.go"
+```go mdox-exec="sed -n '1067,1078p' pkg/receive/handler.go"
 // writeQuorum returns minimum number of replicas that has to confirm write success before claiming replication success.
 func (h *Handler) writeQuorum() int {
 	// NOTE(GiedriusS): this is here because otherwise RF=2 doesn't make sense as all writes