Correct the k3s token command help

[manuelbuil]

Proposed Changes

The k3s token CLI has 5 verbs. 4 relate to bootstrap tokens and 1 is about server tokens (rotate). Based on that, this PR removes some potential confusion in the CLI help by:

• Removing the word "bootstrap" from the general usage description of the tool
• Replacing "bootstrap" by "server" in the description of the "rotate" verb

Types of Changes

Bugfix

Verification

Execute k3s token command and verify that the help description has this PR' changes

Testing

Linked Issues

#11674

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.65%. Comparing base (3fcbac8) to head (bb5956e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11673      +/-   ##
==========================================
- Coverage   48.56%   47.65%   -0.91%     
==========================================
  Files         185      185              
  Lines       19344    19344              
==========================================
- Hits         9394     9218     -176     
- Misses       8608     8792     +184     
+ Partials     1342     1334       -8     

Flag	Coverage Δ
e2etests	40.42% <100.00%> (-3.82%)	⬇️
inttests	34.99% <100.00%> (?)
unittests	17.00% <0.00%> (+<0.01%)	⬆️

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