Fix typos that break dogshell

[louy]

What does this PR do?

Fix a few typos that break dogshell cli

➜  Projects dog --help
Traceback (most recent call last):
  File "/Users/louay/.asdf/installs/python/3.11.1/bin/dog", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/Users/louay/.asdf/installs/python/3.11.1/lib/python3.11/site-packages/datadog/dogshell/__init__.py", line 96, in main
    DashboardListClient.setup_parser(subparsers)
  File "/Users/louay/.asdf/installs/python/3.11.1/lib/python3.11/site-packages/datadog/dogshell/dashboard_list.py", line 128, in setup_parser
    delete_dashboards_v2_parser = verb_parsers.add_parser(
                                  ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/louay/.asdf/installs/python/3.11.1/lib/python3.11/argparse.py", line 1185, in add_parser
    raise ArgumentError(self, _('conflicting subparser: %s') % name)
argparse.ArgumentError: argument verb: conflicting subparser: delete_dashboards
➜  Projects dog --help
Traceback (most recent call last):
  File "/Users/louay/.asdf/installs/python/3.11.1/bin/dog", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/Users/louay/.asdf/installs/python/3.11.1/lib/python3.11/site-packages/datadog/dogshell/__init__.py", line 100, in main
    ServiceLevelObjectiveClient.setup_parser(subparsers)
  File "/Users/louay/.asdf/installs/python/3.11.1/lib/python3.11/site-packages/datadog/dogshell/service_level_objective.py", line 150, in setup_parser
    delete_timeframe_parser = verb_parsers.add_parser("delete_many", help="Delete a SLO timeframe")
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/louay/.asdf/installs/python/3.11.1/lib/python3.11/argparse.py", line 1185, in add_parser
    raise ArgumentError(self, _('conflicting subparser: %s') % name)
argparse.ArgumentError: argument verb: conflicting subparser: delete_many

Description of the Change

Typos in arguments passed to argparse

Alternate Designs

Possible Drawbacks

Verification Process

Tested locally, no more errors being thrown

Additional Notes

Release Notes

Review checklist (to be filled by reviewers)

• Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• PR should not have do-not-merge/ label attached.
• If Applicable, issue must have kind/ and severity/ labels attached at least.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.
Note that the issue will not be automatically closed, but this notification will remind us to investigate why there's been inactivity.

[louy]

Not stale

[nkzou]

Fixed by #760