Fix column alignment in debug-service.md

[jacksgt]

Previously, the columns showing one of kubectl's output were misaligned and thereby confusing.

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[irvifa]

Hey @jacksgt could you please sign the CLA first? Thanks!

[jacksgt]

I signed it!
Just had to go through all the emails and click all the things. :-)

[tengqm]

/lgtm
/approve

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LGTM label has been added.

Git tree hash: 2226d70334503c2824da23fabddd8712eb67d145

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