fix docs tictacto dummy vector env #669

[5cat]

a fix for #669

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[Trinkle23897]

In collector, it will automatically wrap the single instance env to vector env, see

tianshou/tianshou/data/collector.py

Lines 65 to 67 in 278c91a

	if isinstance(env, gym.Env) and not hasattr(env, "__len__"):
	warnings.warn("Single environment detected, wrap to DummyVectorEnv.")
	self.env = DummyVectorEnv([lambda: env]) # type: ignore

So you should modify this line instead of documentation to

        if isinstance(env, (gym.Env, PettingZooEnv)) and not hasattr(env, "__len__"):

[codecov-commenter]

Codecov Report

Merging #749 (95eccaf) into master (128feb6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #749   +/-   ##
=======================================
  Coverage   91.60%   91.60%           
=======================================
  Files          70       70           
  Lines        4934     4934           
=======================================
  Hits         4520     4520           
  Misses        414      414           

Flag	Coverage Δ
unittests	91.60% <ø> (ø)

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