Document --enable-raw-filter operator flag for the raw Fluentd filter

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Adds the new --enable-raw-filter operator CLI flag to the "Operator arguments" reference in content/docs/install/_index.md, under the Controller Management subheading.

Triggered by logging-operator PR #2274 ("feat/support raw fluentd filter"), which introduces a new raw Fluentd filter for Flow/ClusterFlow (configured via filters[].raw.config). The feature is disabled by default and requires the operator to be started with --enable-raw-filter; if a raw filter is used while the flag is off, reconciliation fails.

Scope note: the per-filter reference page (plugins/filters/raw.md), the filters index row, and the flow_types.md CRD reference are machine-generated and will arrive via the operator repo's periodic "Sync generated docs" bulk commit — they are intentionally not hand-authored here.

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Superseded — closing without merging.

This PR documented an operator CLI flag --enable-raw-filter that does not exist in the merged/shipped operator. That flag lived only in intermediate PR commits of kube-logging/logging-operator#2274 and was deliberately removed before merge; the gate was moved onto the Logging CRD as the per-Logging field spec.enableRawFluentdFilter (boolean, default false, fail-closed). Verified against the PR #2274 merge commit 8c36977: main.go registers no --enable-raw-filter flag, and spec.enableRawFluentdFilter is defined on LoggingSpec in pkg/sdk/logging/api/v1beta1/logging_types.go.

A per-Logging CRD field also does not belong in the operator command-line-arguments reference on the install page. The correct enable prerequisite is now documented alongside the feature in #345 ("Document the raw Fluentd filter in Flow and ClusterFlow"), which covers spec.enableRawFluentdFilter: true on content/docs/configuration/flow.md.

Please follow #345 instead.