Fix typo of radisu

[kmu]

This PR just fixes a typo in documentation.

[codecov-commenter]

Codecov Report

Base: 63.83% // Head: 78.19% // Increases project coverage by +14.35% 🎉

Coverage data is based on head (805e48d) compared to base (8d8080e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##            devel    #1954       +/-   ##
===========================================
+ Coverage   63.83%   78.19%   +14.35%     
===========================================
  Files         180      114       -66     
  Lines       16391     9863     -6528     
===========================================
- Hits        10464     7712     -2752     
+ Misses       5927     2151     -3776     

Impacted Files	Coverage Δ
deepmd/descriptor/loc_frame.py	96.21% <ø> (ø)
deepmd/descriptor/se_a_ef.py	54.54% <ø> (ø)
deepmd/descriptor/se_r.py	95.04% <ø> (ø)
deepmd/descriptor/se_t.py	97.34% <ø> (ø)
source/op/prod_force.cc
source/op/tabulate_multi_device.cc
source/lib/src/env_mat_nvnmd.cc
source/op/descrpt_se_a_ef.cc
source/op/tanh4_nvnmd.cc
source/api_cc/src/AtomMap.cc
... and 60 more

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