docs: clarifying skipping steps / jobs

[ChristopherHX]

Some people try to use something for step level if on job level. Make it clear that this is not supposed to work.

Fixes #1474

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	1		0	0.01s
✅ MARKDOWN	markdownlint	1		0	0.28s
✅ REPOSITORY	gitleaks	yes		no	2.7s
✅ REPOSITORY	git_diff	yes		no	0.0s
✅ REPOSITORY	secretlint	yes		no	0.89s

See errors details in artifact MegaLinter reports on CI Job page Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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[codecov[bot]]

Codecov Report

Merging #1480 (9e1ea46) into master (4f8da0a) will increase coverage by 2.89%. The diff coverage is 66.59%.

@@            Coverage Diff             @@
##           master    #1480      +/-   ##
==========================================
+ Coverage   57.50%   60.40%   +2.89%     
==========================================
  Files          32       44      +12     
  Lines        4594     7000    +2406     
==========================================
+ Hits         2642     4228    +1586     
- Misses       1729     2465     +736     
- Partials      223      307      +84     

Impacted Files	Coverage Δ
pkg/common/file.go	0.00% <0.00%> (ø)
pkg/container/docker_logger.go	52.08% <ø> (ø)
pkg/container/host_environment.go	0.00% <0.00%> (ø)
pkg/container/util.go	0.00% <0.00%> (ø)
pkg/model/action.go	0.00% <0.00%> (ø)
pkg/model/step_result.go	0.00% <ø> (ø)
pkg/container/docker_run.go	12.82% <11.53%> (+7.27%)	:arrow_up:
pkg/model/workflow.go	45.65% <23.58%> (-5.26%)	:arrow_down:
...ontainer/linux_container_environment_extensions.go	24.32% <24.32%> (ø)
pkg/container/docker_pull.go	33.33% <33.33%> (ø)
... and 37 more

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[20k-ultra]

is mergify suppose to kick in here and merge .. ?

[KnisterPeter]

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