Fix typo in training.md

[JingchaoZhang]

right <-> left

[codecov-commenter]

Codecov Report

Merging #1241 (6bcd046) into master (159e45d) will decrease coverage by 11.66%.
The diff coverage is n/a.

❗ Current head 6bcd046 differs from pull request most recent head bf9349b. Consider uploading reports for the commit bf9349b to get more accurate results

@@             Coverage Diff             @@
##           master    #1241       +/-   ##
===========================================
- Coverage   75.95%   64.28%   -11.67%     
===========================================
  Files          91        5       -86     
  Lines        7260       14     -7246     
===========================================
- Hits         5514        9     -5505     
+ Misses       1746        5     -1741     

Impacted Files	Coverage Δ
deepmd/__main__.py
deepmd/entrypoints/freeze.py
deepmd/utils/pair_tab.py
deepmd/entrypoints/main.py
deepmd/descriptor/se_t.py
deepmd/fit/__init__.py
deepmd/env.py
deepmd/entrypoints/__init__.py
source/op/_prod_virial_se_a_grad.py
deepmd/train/run_options.py
... and 76 more

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[wanghan-iapcm]

Could you please merge the deepmodeling/devel to fix the bug in CI? see #1237