Remove warning

src/one-body-sample.parset

@@ -16,7 +16,8 @@ E = 1e6 # 2e6 is okay; at 5e6 we basically have no convergence
 # "Most steels and rigid polymers when used within their design limits
 # (before yield) exhibit values of about 0.3"
 # -- http://en.wikipedia.org/wiki/Poisson's_ratio
-nu = 0.3 # WARNING: At 0.48 we hardly have convergence; at 0.45 it's weird
+nu = 0.3 # Needs to be strictly below 0.5; the closer we get, the
+         # tougher the problem. But we do have convergence!
 
 [solver]
 tolerance = 1e-12