Fix default values doc for min-worker-lifetime & legion-skew-tolerance

[thomas-riccardi]

I reviewed all options that mention default in their help string and found these two discrepancies.

sources:

• uwsgi/core/init.c

  Lines 140 to 141 in ee46b79

  	// a workers hould be running for at least 10 seconds
  	uwsgi.min_worker_lifetime = 10;

• uwsgi/core/legion.c

  Lines 492 to 493 in ee46b79

  	if (!uwsgi.legion_skew_tolerance)
  	uwsgi.legion_skew_tolerance = 60;

[xrmx]

Good catch!