b2,s3,azurefiles,drive: fix flag names in option help

The help for these options named flags that do not exist, so copying
them gives "unknown flag": --sse-customer-key(-base64) is
--b2-/--s3-sse-customer-key(-base64), --azurefile-upload-concurrency is
--azurefiles-upload-concurrency and --ignore size is --ignore-size.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/azurefiles/azurefiles.go

@@ -79,7 +79,7 @@ This is required and is the name of the share to access.
 			Help: `Upload chunk size.
 
 Note that this is stored in memory and there may be up to
-"--transfers" * "--azurefile-upload-concurrency" chunks stored at once
+"--transfers" * "--azurefiles-upload-concurrency" chunks stored at once
 in memory.`,
 			Default:  defaultChunkSize,
 			Advanced: true,
@@ -95,7 +95,7 @@ links and these uploads do not fully utilize your bandwidth, then
 increasing this may help to speed up the transfers.
 
 Note that chunks are stored in memory and there may be up to
-"--transfers" * "--azurefile-upload-concurrency" chunks stored at once
+"--transfers" * "--azurefiles-upload-concurrency" chunks stored at once
 in memory.`,
 			Default:  16,
 			Advanced: true,

backend/b2/b2.go

@@ -277,7 +277,7 @@ See: [rclone backend lifecycle](#lifecycle) for setting lifecycles after bucket
 			Name: "sse_customer_key",
 			Help: `To use SSE-C, you may provide the secret encryption key encoded in a UTF-8 compatible string to encrypt/decrypt your data
 
-Alternatively you can provide --sse-customer-key-base64.`,
+Alternatively you can provide --b2-sse-customer-key-base64.`,
 			Advanced: true,
 			Examples: []fs.OptionExample{{
 				Value: "",
@@ -288,7 +288,7 @@ Alternatively you can provide --sse-customer-key-base64.`,
 			Name: "sse_customer_key_base64",
 			Help: `To use SSE-C, you may provide the secret encryption key encoded in Base64 format to encrypt/decrypt your data
 
-Alternatively you can provide --sse-customer-key.`,
+Alternatively you can provide --b2-sse-customer-key.`,
 			Advanced: true,
 			Examples: []fs.OptionExample{{
 				Value: "",

backend/drive/drive.go

@@ -568,7 +568,7 @@ recommended usage is using the flag form --drive-size-as-quota when
 doing rclone ls/lsl/lsf/lsjson/etc only.
 
 If you do use this flag for syncing (not recommended) then you will
-need to use --ignore size also.`,
+need to use --ignore-size also.`,
 			Advanced: true,
 			Hide:     fs.OptionHideConfigurator,
 		}, {

backend/s3/s3.go

@@ -190,7 +190,7 @@ header is added and the default (private) will be used.
 			Name: "sse_customer_key",
 			Help: `To use SSE-C you may provide the secret encryption key used to encrypt/decrypt your data.
 
-Alternatively you can provide --sse-customer-key-base64.`,
+Alternatively you can provide --s3-sse-customer-key-base64.`,
 			Advanced: true,
 			Examples: []fs.OptionExample{{
 				Value: "",
@@ -201,7 +201,7 @@ Alternatively you can provide --sse-customer-key-base64.`,
 			Name: "sse_customer_key_base64",
 			Help: `If using SSE-C you must provide the secret encryption key encoded in base64 format to encrypt/decrypt your data.
 
-Alternatively you can provide --sse-customer-key.`,
+Alternatively you can provide --s3-sse-customer-key.`,
 			Advanced: true,
 			Examples: []fs.OptionExample{{
 				Value: "",