Make example in limit.adoc deterministic (#411)

This makes the example always return the same result by enforcing an
ordering, so that we don't need to skip testing its result (this PR
updates #405). The sense of the example is unaffected.

Author: stefano-ottolenghi

modules/ROOT/pages/clauses/limit.adoc

@@ -146,6 +146,7 @@ MATCH (n)
 WITH n ORDER BY n.name LIMIT 1
 SET n.locked = true
 RETURN n
+ORDER BY n.name
 ----
 
 Writes `locked` property on one node and return that node: