fix typo in the doc of loc_frame

[amcadmus]

fixes #1962

[codecov-commenter]

Codecov Report

Base: 64.07% // Head: 64.07% // No change to project coverage 👍

Coverage data is based on head (8850a97) compared to base (7eb5bda).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #1963   +/-   ##
=======================================
  Coverage   64.07%   64.07%           
=======================================
  Files         181      181           
  Lines       16558    16558           
=======================================
  Hits        10610    10610           
  Misses       5948     5948           

Impacted Files	Coverage Δ
deepmd/descriptor/loc_frame.py	96.21% <ø> (ø)
deepmd/utils/argcheck.py	90.20% <ø> (ø)

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[njzjz]

Changes should be synced here:

deepmd-kit/deepmd/utils/argcheck.py

Lines 106 to 112 in 923b98c

	doc_axis_rule = 'A list of integers. The length should be 6 times of the number of types. \n\n\
	- axis_rule[i*6+0]: class of the atom defining the first axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.\n\n\
	- axis_rule[i*6+1]: type of the atom defining the first axis of type-i atom.\n\n\
	- axis_rule[i*6+2]: index of the axis atom defining the first axis. Note that the neighbors with the same class and type are sorted according to their relative distance.\n\n\
	- axis_rule[i*6+3]: class of the atom defining the first axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.\n\n\
	- axis_rule[i*6+4]: type of the atom defining the second axis of type-i atom.\n\n\
	- axis_rule[i*6+5]: class of the atom defining the second axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.'