docs: minor edits to Cloud Build docs

[maggieneterval]

Related: #8383

Description

Minor edits to the Cloud Build page:

• After introducing the product as "Google Cloud Build" for clarity, consistently name it as "Cloud Build" for consistency with GCP docs.
• Use a consistent tense.
• Prefer bulleted lists to comma-separated items.
• Update "Faster builds" section wording for clarity.

Next steps

• Add link to Cloud Build tutorial, when published.

[codecov]

Codecov Report

Merging #8571 (6314932) into main (290280e) will decrease coverage by 6.27%.
The diff coverage is 53.80%.

@@            Coverage Diff             @@
##             main    #8571      +/-   ##
==========================================
- Coverage   70.48%   64.21%   -6.27%     
==========================================
  Files         515      613      +98     
  Lines       23150    30689    +7539     
==========================================
+ Hits        16317    19708    +3391     
- Misses       5776     9503    +3727     
- Partials     1057     1478     +421     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/flags.go	93.00% <ø> (+2.18%)	⬆️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <ø> (ø)
... and 38 more

... and 391 files with indirect coverage changes

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[aaron-prindle]

LGTM!

Left one comment related to changing the wording as you mentioned a potential change there (adding some text to state explicity that Cloud Build is doing the builds in parallel)