Update s3-repository docs after upgrade

These changes are to bring the docs into alignment with the changes made as part of the S3 upgrade elastic/elasticsearch#126843

Author: nicktindall

deploy-manage/tools/snapshot-and-restore/s3-repository.md

@@ -87,11 +87,13 @@ The following list contains the available client settings. Those that must be st
 :   An S3 session token. If set, the `access_key` and `secret_key` settings must also be specified.
 
 `endpoint`
-:   The S3 service endpoint to connect to. This defaults to `s3.amazonaws.com` but the [AWS documentation](https://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region) lists alternative S3 endpoints. If you are using an [S3-compatible service](#repository-s3-compatible-services) then you should set this to the service’s endpoint.
+:   The S3 service endpoint to connect to. This defaults to `https://s3.amazonaws.com` but the [AWS documentation](https://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region) lists alternative S3 endpoints. If you are using an [S3-compatible service](#repository-s3-compatible-services) then you should set this to the service’s endpoint. The endpoint should specify the protocol and host name, e.g. `https://s3.ap-southeast-4.amazonaws.com`, `http://minio.local:9000`.
 
 `protocol`
 :   The protocol to use to connect to S3. Valid values are either `http` or `https`. Defaults to `https`. When using HTTPS, this repository type validates the repository’s certificate chain using the JVM-wide truststore. Ensure that the root certificate authority is in this truststore using the JVM’s `keytool` tool. If you have a custom certificate authority for your S3 repository and you use the {{es}} [bundled JDK](../../deploy/self-managed/installing-elasticsearch.md#jvm-version), then you will need to reinstall your CA certificate every time you upgrade {{es}}.
 
+Deprecated: This setting is ignored since version 8.19, specify the protocol in the `endpoint` setting instead.
+
 `proxy.host`
 :   The host name of a proxy to connect to S3 through.
 
@@ -119,6 +121,8 @@ The following list contains the available client settings. Those that must be st
 `use_throttle_retries`
 :   Whether retries should be throttled (i.e. should back off). Must be `true` or `false`. Defaults to `true`.
 
+Deprecated: This setting is ignored since version 8.19, retries are always throttled.
+
 `path_style_access`
 :   Whether to force the use of the path style access pattern. If `true`, the path style access pattern will be used. If `false`, the access pattern will be automatically determined by the AWS Java SDK (See [AWS documentation](https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3Builder.html#setPathStyleAccessEnabled-java.lang.Boolean-) for details). Defaults to `false`.
 
@@ -133,7 +137,7 @@ In versions `7.0`, `7.1`, `7.2` and `7.3` all bucket operations used the [now-de
 :   Whether chunked encoding should be disabled or not. If `false`, chunked encoding is enabled and will be used where appropriate. If `true`, chunked encoding is disabled and will not be used, which may mean that snapshot operations consume more resources and take longer to complete. It should only be set to `true` if you are using a storage service that does not support chunked encoding. See the [AWS Java SDK documentation](https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3Builder.html#disableChunkedEncoding--) for details. Defaults to `false`.
 
 `region`
-:   Allows specifying the signing region to use. Specificing this setting manually should not be necessary for most use cases. Generally, the SDK will correctly guess the signing region to use. It should be considered an expert level setting to support S3-compatible APIs that require [v4 signatures](https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html) and use a region other than the default `us-east-1`. Defaults to empty string which means that the SDK will try to automatically determine the correct signing region.
+:   Specifies the signing region to use. If not specified, the SDK will attempt to guess the signing region to use, but it is recommended to configure this explicitly. Defaults to empty string which means that the SDK will try to automatically determine the correct signing region.
 
 `signer_override`
 :   Allows specifying the name of the signature algorithm to use for signing requests by the S3 client. Specifying this setting should not be necessary for most use cases. It should be considered an expert level setting to support S3-compatible APIs that do not support the signing algorithm that the SDK automatically determines for them. See the [AWS Java SDK documentation](https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/ClientConfiguration.html#setSignerOverride-java.lang.String-) for details. Defaults to empty string which means that no signing algorithm override will be used.