Add TEPPO documentation

[nicolengsy]

To close #2016 .

[codecov]

Codecov Report

Merging #2161 (51543c2) into master (3b3ad04) will decrease coverage by 0.20%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2161      +/-   ##
==========================================
- Coverage   91.51%   91.31%   -0.21%     
==========================================
  Files         197      198       +1     
  Lines       10864    10944      +80     
  Branches     1370     1374       +4     
==========================================
+ Hits         9942     9993      +51     
- Misses        666      691      +25     
- Partials      256      260       +4     

Impacted Files	Coverage Δ
src/garage/sampler/_dtypes.py	90.90% <0.00%> (-9.10%)	⬇️
src/garage/np/_functions.py	77.39% <0.00%> (-7.04%)	⬇️
src/garage/_environment.py	95.45% <0.00%> (-1.99%)	⬇️
src/garage/_dtypes.py	96.01% <0.00%> (-1.19%)	⬇️
src/garage/sampler/vec_worker.py	88.98% <0.00%> (-0.74%)	⬇️
src/garage/trainer.py	90.94% <0.00%> (-0.18%)	⬇️
src/garage/torch/_functions.py	94.68% <0.00%> (-0.06%)	⬇️
src/garage/tf/algos/te.py	100.00% <0.00%> (ø)
src/garage/tf/algos/npo.py	96.46% <0.00%> (ø)
src/garage/torch/algos/bc.py	92.10% <0.00%> (ø)
... and 21 more

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[gitanshu]

@Mergifyio refresh

[mergify]

Command refresh: success

Pull request refreshed

[krzentner]

Please apply Ruofu's fix. Besides that, this change looks good.

[yeukfu]

@Mergifyio refresh

[mergify]

Command refresh: success

Pull request refreshed