docs: add links to documentation in LAMMPS input

[njzjz]

Closes #2425.

It takes work to explain everything in the comment. So, instead, I add a link to the documentation.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ad8536f) 75.22% compared to head (67c2a49) 75.22%.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #2453   +/-   ##
=======================================
  Coverage   75.22%   75.22%           
=======================================
  Files         223      223           
  Lines       22691    22691           
  Branches     1659     1673   +14     
=======================================
+ Hits        17069    17070    +1     
+ Misses       4526     4525    -1     
  Partials     1096     1096           

see 1 file with indirect coverage changes

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[wanghan-iapcm]

The link does not work.
We did not say that the type map is optional in the pair_coeff command.

[njzjz]

The link does not work. We did not say that the type map is optional in the pair_coeff command.

We gave the following sentence in the documentation:

If atom names are not set in the pair_coeff command, the training parameter type_map will be used by default.