doc: chip_tool_guide: style and consistency edits (#25731)

* doc: chip_tool_guide: style and consistency edits

Edited the CHIP Tool guide for style and structure consistency.

Signed-off-by: Grzegorz Ferenc <Grzegorz.Ferenc@nordicsemi.no>

* Restyled by prettier-markdown

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Signed-off-by: Grzegorz Ferenc <Grzegorz.Ferenc@nordicsemi.no>
Co-authored-by: Restyled.io <commits@restyled.io>