Modify contributing md scripts to solve conflicts between doc and scripts

[tiruka]

Pull Request Template

Checklist

• Confirmed that run-checks all script has been executed.
• Made sure the book is up to date with changes in this PR.

Related Issues/PRs

Fixes #2106

Changes

1.no_std is typo, but it should be no-std

no_std is typo, but it should be no-std

The doc tell that there are only two environment of std and no-std, but it now includes four environments due to script.

% ./run-checks.sh no_std
    Finished `dev` profile [optimized] target(s) in 0.16s
     Running `target/debug/xtask run-checks no_std`
error: invalid value 'no_std' for '<ENV>'
  [possible values: all, std, no-std, typos, examples]

  tip: a similar value exists: 'no-std'

For more information, try '--help'.

2.environment values

“If no environment value has been passed, run both std and no_std checks”, this is incorrect because when I use the script without environment args, it causes an error as follow.

% ./run-checks.sh       
    Finished `dev` profile [optimized] target(s) in 0.15s
     Running `target/debug/xtask run-checks`
error: the following required arguments were not provided:
  <ENV>

Usage: xtask run-checks <ENV>

It is because the implementation and docs are different. As of now, I believe script comments are correct and modify the codes by modifying default value so as to keep All as it is and executes checks except examples. But if you prefer to others, I will follow it, so please let me know.

3.torch installation.
I got in trouble when executing ./run-checks.sh all because I have never installed torch on my pc. It is because ./run-checks.sh all executes crates/burn-tch and it requires torch installation. Therefore, adding the link of crates/burn-tch will definitely help developers like me to solve the issue, so I added the link on the CONTRIBUTING.md.

Testing

I run ./run-check.sh and checked out All is executed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.23%. Comparing base (f7639bd) to head (5b38464).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2107   +/-   ##
=======================================
  Coverage   86.23%   86.23%           
=======================================
  Files         688      688           
  Lines       88465    88465           
=======================================
  Hits        76285    76285           
  Misses      12180    12180           

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[antimora]

LGTM!

Thanks for improving the script and documentation!