rpk: fix doubled "are" in rpk group help text

[micheleRP]

Summary

Fix a doubled word in the rpk group long help text: "if you add more consumers to a group than there are are total partitions to consume" → "...than there are total partitions...".

Why

This help string (group.go) is the source for the auto-generated rpk group reference page in the docs. Fixing it here corrects both rpk group -h and the generated docs, rather than patching the generated .adoc (which gets overwritten on regeneration).

Reported via a docs typo fix (redpanda-data/docs#1746).

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v26.1.x
• v25.3.x
• v25.2.x

Release Notes

• none

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[Copilot]

Pull request overview

Fixes a typo in the rpk group command long help text so the CLI help output and the auto-generated reference docs no longer contain a doubled word.

Changes:

• Corrects “there are are total partitions” → “there are total partitions” in rpk group long help text.

[vbotbuildovich]

Retry command for Build#86199

please wait until all jobs are finished before running the slash command

/ci-repeat 1
skip-redpanda-build
skip-units
skip-rebase
tests/rptest/tests/datalake/datalake_table_name_test.py::DatalakeTableNameTest.test_topic_name_dot_replacement@{"catalog_type":"rest_hadoop","cloud_storage_type":1}

[vbotbuildovich]

CI test results

test results on build#86199

test_status	test_class	test_method	test_arguments	test_kind	job_url	passed	reason	test_history
FLAKY(FAIL)	DatalakeTableNameTest	test_topic_name_dot_replacement	{"catalog_type": "rest_hadoop", "cloud_storage_type": 1}	integration	https://buildkite.com/redpanda/redpanda/builds/86199#019ef6e0-5cb1-43f7-96e5-8a2c750cb823	3/11	Test FAILS after retries.Significant increase in flaky rate(baseline=0.0064, p0=0.0000, reject_threshold=0.0100)	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=DatalakeTableNameTest&test_method=test_topic_name_dot_replacement
FLAKY(PASS)	TopicRecreateTest	test_topic_recreation_while_producing	{"cleanup_policy": "delete", "workload": "ACKS_1"}	integration	https://buildkite.com/redpanda/redpanda/builds/86199#019ef6e0-5cad-4621-bc3b-269ac8ea3a39	10/11	Test PASSES after retries.No significant increase in flaky rate(baseline=0.0017, p0=1.0000, reject_threshold=0.0100. adj_baseline=0.1000, p1=0.3487, trust_threshold=0.5000)	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=TopicRecreateTest&test_method=test_topic_recreation_while_producing

[r-vasquez]

/ci-repeat 1
skip-redpanda-build
skip-units
skip-rebase
tests/rptest/tests/datalake/datalake_table_name_test.py::DatalakeTableNameTest.test_topic_name_dot_replacement@{"catalog_type":"rest_hadoop","cloud_storage_type":1}