chore(cli): enhance generate no-build description (#6031)

[dtmzr]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

In #6031 enhancing the description for generate --build was requested, I hope rephrasing and adding some information helps.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #7460 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #7460   +/-   ##
=======================================
  Coverage   70.32%   70.32%           
=======================================
  Files          88       88           
  Lines        3704     3704           
  Branches     1010     1010           
=======================================
  Hits         2605     2605           
  Misses        892      892           
  Partials      207      207           

Flag	Coverage Δ
#unittests	70.32% <ø> (ø)

Impacted Files	Coverage Δ
packages/cli/src/commands/generate.js	93.75% <ø> (ø)

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[pi0]

Thanks! BTW new nuxt export command is progressive (in way of build once) by default