Alarm ID "250.002" obsolete, remove from docs

[Agustin Carranza]

Brief Description
-----------------
Please, review the current documentation and, if found obsolete, remove the referenced alarm from alarm list.

Severity
--------
Provide the severity of the defect.
Minor: System/Feature is usable with minor issue

Steps to Reproduce
------------------
Check alarm documentation.

Expected Behavior
------------------
250.002 alarm is not shown in documentation.

Actual Behavior
----------------
250.002 alarm is shown in documentation.

Reproducibility
---------------
100% reproducible

System Configuration
--------------------
NTR

Branch/Pull Time/Commit
-----------------------
master

Last Pass
---------
NTR

Timestamp/Logs
--------------
NTR

Test Activity
-------------
Normal use of documentation

Workaround
----------
NTR

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/fault/+/886194
Committed: https://opendev.org/starlingx/fault/commit/063021cd7069be9fc8ed2e1ec048bac84788f0e2
Submitter: "Zuul (22348)"
Branch: master

commit 063021cd7069be9fc8ed2e1ec048bac84788f0e2
Author: Agustin Carranza <email address hidden>
Date: Thu Jun 15 13:34:04 2023 -0300

    Remove 250.002 alarm from events.yaml file

    The 250.002 alarm has been deprecated long time ago.
    This change deletes it from the alarm list.

    Test plan:
    PASS:
    * Build fm-doc and fm-api packages.
    * Check that all parsing checks were run and package was built
      successfully.

    Depends-on: https://review.opendev.org/c/starlingx/distcloud/+/886001

    Closes-bug: 2024010

    Signed-off-by: Agustin Carranza <email address hidden>
    Change-Id: I0180bd5addc1feae6e3e45edd24c1f50d6622e2c