Regenerate API docs and update example timestamps

Fixes the CI "Run code generation checks" failure by regenerating the
API reference documentation to match the updated ExpiresAt field comment
from commit 2f8f841.

Changes:
- Run 'make docs' to regenerate docs/api-reference/api.md
  - Updates ExpiresAt description from "If not set along with TTL"
    to "If neither ExpiresAt nor TTL is set" for clarity
- Update example timestamps in docs/usage/bmcuser-ttl.md
  - Change from past dates (2026-04-10/11) to future dates (2026-05-18/19)
  - Maintains 30-minute warning period context in examples

All functional bugs were already fixed in commit 2f8f841 - this is
purely documentation cleanup to unblock CI.

Signed-off-by: Stefan Hipfel <stefan.hipfel@sap.com>

Author: stefanhipfel

docs/api-reference/api.md

@@ -715,7 +715,7 @@ _Appears in:_
 | `bmcSecretRef` _[LocalObjectReference](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.35/#localobjectreference-v1-core)_ | BMCSecretRef references the BMCSecret containing the credentials for this user.<br />If not set, the operator will generate a secure password based on BMC manufacturer requirements. |  |  |
 | `bmcRef` _[LocalObjectReference](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.35/#localobjectreference-v1-core)_ | BMCRef references the BMC this user should be created on. |  |  |
 | `ttl` _[Duration](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.35/#duration-v1-meta)_ | TTL specifies the time-to-live duration for this user.<br />When set, the user will be automatically deleted after this duration from creation.<br />This is useful for temporary debugging users.<br />If not set, the user is permanent (no automatic deletion).<br />Mutually exclusive with ExpiresAt - only one should be set. |  | Pattern: `^([0-9]+(\.[0-9]+)?(ns\|us\|µs\|ms\|s\|m\|h))+$` <br />Type: string <br /> |
-| `expiresAt` _[Time](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.35/#time-v1-meta)_ | ExpiresAt specifies an absolute timestamp when this user should be deleted.<br />This is useful for users that need to expire at a specific time.<br />If not set along with TTL, the user is permanent.<br />Mutually exclusive with TTL - only one should be set. |  |  |
+| `expiresAt` _[Time](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.35/#time-v1-meta)_ | ExpiresAt specifies an absolute timestamp when this user should be deleted.<br />This is useful for users that need to expire at a specific time.<br />If neither ExpiresAt nor TTL is set, the user is permanent (no automatic deletion).<br />Mutually exclusive with TTL - only one should be set. |  |  |
 
 
 #### BMCUserStatus

docs/usage/bmcuser-ttl.md

@@ -138,8 +138,8 @@ $ kubectl get bmcuser -o wide
 
 NAME                        ID   USERNAME          ROLEID         EXPIRESAT               LASTROTATION   AGE
 bmcuser-permanent           5    admin             Administrator  <none>                  2h ago         3d
-bmcuser-debug-temporary     6    debug-admin       Administrator  2026-04-10T23:00:00Z    1h ago         7h
-bmcuser-maintenance-window  7    maintenance-user  Operator       2026-04-11T02:00:00Z    <none>         4h
+bmcuser-debug-temporary     6    debug-admin       Administrator  2026-05-18T23:00:00Z    1h ago         7h
+bmcuser-maintenance-window  7    maintenance-user  Operator       2026-05-19T02:00:00Z    <none>         4h
 ```
 
 ### Check User Status
@@ -150,12 +150,12 @@ $ kubectl describe bmcuser bmcuser-debug-temporary
 ...
 Status:
   Conditions:
-    Last Transition Time:  2026-04-10T22:30:00Z
-    Message:              User will expire in 30m at 2026-04-10T23:00:00Z
+    Last Transition Time:  2026-05-18T22:30:00Z
+    Message:              User will expire in 30m at 2026-05-18T23:00:00Z
     Reason:               ExpiringSoon
     Status:               True
     Type:                 Active
-  Expires At:             2026-04-10T23:00:00Z
+  Expires At:             2026-05-18T23:00:00Z
   ID:                     6
   ...
 ```