sys/shell/gnrc_netif: fix ifconfig set language issue

[krzysztof-cabaj]

Contribution description

This PR fix some language issues in the output of ifconfig set.

Testing procedure

Compile any program with gnrc_netif module, for example examples/gcoap.
Compare last line of presented outputs.

Output of ifconfig help without this PR.

All up, running the shell now
> ifconfig help
ifconfig help
usage: ifconfig help
usage: ifconfig <if_id> [up|down]
usage: ifconfig <if_id> set <key> <value>
      Sets an hardware specific specific value

Output of ifconfig help with this PR.

All up, running the shell now
> ifconfig help
ifconfig help
usage: ifconfig
usage: ifconfig help
usage: ifconfig <if_id> [up|down]
usage: ifconfig <if_id> set <key> <value>
      Sets a hardware specific value

Issues/PRs references

None

[riot-ci]

Murdock results

✔️ PASSED

ce9c883 sys/shell/gnrc_netif: fix ifconfig set language issue

Success	Failures	Total	Runtime
7937	0	7937	14m:56s

Artifacts

• Documentation preview

[yarrick]

bors merge

[bors]

👎 Rejected by too few approved reviews

[yarrick]

bors merge

[bors]

Build succeeded!

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• Murdock
• static-tests
• tools-build-success