[TT-14838] GW 5.8.3 Update documentation

[buger]

Triggered by: lghiur

Included:

Tyk Gateway: true
Tyk Dashboard: false
Tyk MDCB false
Tyk Pump false

Intended for: master
Changes sourced from: release-5.8.3
Config info generator branch: main

Note: Gateway docs updates for release-5.8.3 (branch suffix: docs)

JIRA: https://tyktech.atlassian.net/browse/TT-14838

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⚡ Recommended focus areas for review Documentation Accuracy The new configuration options for readiness check, graceful shutdown timeout, and gRPC round robin load balancing should be validated for accuracy and completeness. Ensure that the documented environment variables, types, and default values match the actual implementation. HealthCheckEndpointName Enables you to change the liveness endpoint. Default is "/hello" ### readiness_check_endpoint_name ENV: <b>TYK_GW_READINESSCHECKENDPOINTNAME</b><br /> Type: `string`<br /> ReadinessCheckEndpointName Enables you to change the readiness endpoint Default is "/ready" ### graceful_shutdown_timeout_duration ENV: <b>TYK_GW_GRACEFULSHUTDOWNTIMEOUTDURATION</b><br /> Type: `int`<br /> GracefulShutdownTimeoutDuration sets how many seconds the gateway should wait for an existing connection to finish before shutting down the server. Defaults to 30 seconds. Deprecation Notice Clarity The deprecation notice for ExternalOAuth has been updated. Confirm that the language is clear and consistent with other deprecation notices, and that it accurately reflects the product's deprecation policy. Deprecated: ExternalOAuth support has been deprecated from 5.7.0. To avoid any disruptions, we recommend that you use JSON Web Token (JWT) instead,

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[andyo-tyk]

Suggested change

	Enabled enables context variables to be passed to Tyk middlewares.
	Enabled provides access to context variables from specific Tyk middleware (URL rewrite, header and body transform).

[andyo-tyk]

Improve clarity for gRPC plugin load balancing

[andyo-tyk]

Suggested change

	GRPCRoundRobinLoadBalancing enables round robin load balancing for gRPC services
	GRPCRoundRobinLoadBalancing enables round robin load balancing for gRPC services; you must provide the address of the load balanced service using `dns:///` protocol in `coprocess_grpc_server`.