Rename NotifyKiller to Enforcer in docs

[shidoxo]

Changed all occurrences of "killer" to enforcer in selectors.md

Fixes: #2517

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[kkourt]

Thank you!

[mtardy]

Thanks for this page of the doc I think it's good!

I'll note there are still some references globally in docs that could be changed and could be added in the issue: it's mostly docs in the tracing_policy_types.go and .proto that gets propagated through generation.

rg -g '!.git' -g '!vendor' -i killer

You get an output similar to this:

pkg/api/tracingapi/client_kprobe.go
27:     ActionNotifyKiller = 12

install/kubernetes/tetragon/crds-yaml/cilium.io_tracingpolicies.yaml
95:                description: A killer spec.

install/kubernetes/tetragon/crds-yaml/cilium.io_tracingpoliciesnamespaced.yaml
95:                description: A killer spec.

patch
40:+        # for killer tests on 32 bits syscall values

docs/content/en/docs/reference/grpc-api.md
677:| KPROBE_ACTION_NOTIFYENFORCER | 13 | NotifyEnforcer action notifies killer sensor. |

pkg/k8s/apis/cilium.io/client/crds/v1alpha1/cilium.io_tracingpolicies.yaml
95:                description: A killer spec.

pkg/k8s/apis/cilium.io/client/crds/v1alpha1/cilium.io_tracingpoliciesnamespaced.yaml
95:                description: A killer spec.

contrib/upgrade-notes/v1.1.0.md
15:* Killer is renamed to enforcer. If using policies with killers, you need to replace `killers` with `enforcers` and `action: NotifyKiller` with `action: NotifyEnforcer`.

pkg/k8s/apis/cilium.io/v1alpha1/tracing_policy_types.go
105:    // A killer spec.

bpf/process/types/basic.h
110:    ACTION_NOTIFY_KILLER = 12,
2217:   case ACTION_NOTIFY_KILLER:

pkg/grpc/tracing/tracing.go
63:     case tracingapi.ActionNotifyKiller:

api/v1/tetragon/tetragon.pb.go
58:     // NotifyEnforcer action notifies killer sensor.

api/v1/tetragon/tetragon.proto
464:    // NotifyEnforcer action notifies killer sensor.

api/v1/README.md
1114:| KPROBE_ACTION_NOTIFYENFORCER | 13 | NotifyEnforcer action notifies killer sensor. |