fix(docs/gnokey): addpkg subcommand documentation

[Nemanya8]

Removed send flag and removed white spaces

[Gno2D2]

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Changes to 'docs' folder must be reviewed/authored by at least one devrel and one tech-staff

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    └── 🟢 A changed file matches this pattern: ^docs/ (filename: docs/gno-tooling/cli/gnokey/state-changing-calls.md)

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Pending initial approval by a review team member, or review from tech-staff

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└── 🟢 If
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    │       ├── 🟢 At least 1 user(s) of the team tech-staff reviewed pull request
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Can be checked by

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[leohhhn]

lgtm

[aeddi]

LGTM 👍