docs: fix the docs of numb_btch

[njzjz]

Fix #2231.

[codecov-commenter]

Codecov Report

Base: 75.65% // Head: 74.95% // Decreases project coverage by -0.70% ⚠️

Coverage data is based on head (40ab87f) compared to base (b474a30).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2257      +/-   ##
==========================================
- Coverage   75.65%   74.95%   -0.71%     
==========================================
  Files         204      117      -87     
  Lines       20259    10180   -10079     
  Branches     1438        0    -1438     
==========================================
- Hits        15327     7630    -7697     
+ Misses       4025     2550    -1475     
+ Partials      907        0     -907     

Impacted Files	Coverage Δ
deepmd/utils/argcheck.py	90.20% <100.00%> (-0.16%)	⬇️
deepmd/__main__.py	0.00% <0.00%> (-100.00%)	⬇️
deepmd/descriptor/se_atten.py	11.70% <0.00%> (-81.65%)	⬇️
deepmd/utils/finetune.py	32.00% <0.00%> (-56.00%)	⬇️
deepmd/entrypoints/convert.py	26.66% <0.00%> (-40.00%)	⬇️
deepmd/infer/deep_tensor.py	53.03% <0.00%> (-37.88%)	⬇️
deepmd/train/run_options.py	72.32% <0.00%> (-16.18%)	⬇️
deepmd/fit/dipole.py	79.79% <0.00%> (-15.16%)	⬇️
deepmd/fit/ener.py	76.92% <0.00%> (-12.31%)	⬇️
deepmd/utils/graph.py	73.80% <0.00%> (-11.12%)	⬇️
... and 121 more

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