docs: don't show fictional example values for options as multiple choice items

See #5538

backend/ftp/ftp.go

@@ -48,12 +48,8 @@ func init() {
 		NewFs:       NewFs,
 		Options: []fs.Option{{
 			Name:     "host",
-			Help:     "FTP host to connect to.",
+			Help:     "FTP host to connect to.\n\nE.g. \"ftp.example.com\".",
 			Required: true,
-			Examples: []fs.OptionExample{{
-				Value: "ftp.example.com",
-				Help:  "Connect to ftp.example.com",
-			}},
 		}, {
 			Name: "user",
 			Help: "FTP username, leave blank for current username, " + currentUser + ".",

backend/hdfs/hdfs.go

@@ -19,12 +19,8 @@ func init() {
 		NewFs:       NewFs,
 		Options: []fs.Option{{
 			Name:     "namenode",
-			Help:     "Hadoop name node and port.",
+			Help:     "Hadoop name node and port.\n\nE.g. \"namenode:8020\" to connect to host namenode at port 8020.",
 			Required: true,
-			Examples: []fs.OptionExample{{
-				Value: "namenode:8020",
-				Help:  "Connect to host namenode at port 8020.",
-			}},
 		}, {
 			Name:     "username",
 			Help:     "Hadoop user name.",
@@ -38,12 +34,9 @@ func init() {
 			Help: `Kerberos service principal name for the namenode.
 
 Enables KERBEROS authentication. Specifies the Service Principal Name
-(SERVICE/FQDN) for the namenode.`,
+(SERVICE/FQDN) for the namenode. E.g. \"hdfs/namenode.hadoop.docker\"
+for namenode running as service 'hdfs' with FQDN 'namenode.hadoop.docker'.`,
 			Required: false,
-			Examples: []fs.OptionExample{{
-				Value: "hdfs/namenode.hadoop.docker",
-				Help:  "Namenode running as service 'hdfs' with FQDN 'namenode.hadoop.docker'.",
-			}},
 			Advanced: true,
 		}, {
 			Name: "data_transfer_protection",

backend/http/http.go

@@ -38,15 +38,8 @@ func init() {
 		NewFs:       NewFs,
 		Options: []fs.Option{{
 			Name:     "url",
-			Help:     "URL of http host to connect to.",
+			Help:     "URL of http host to connect to.\n\nE.g. \"https://example.com\", or \"https://user:pass@example.com\" to use a username and password.",
 			Required: true,
-			Examples: []fs.OptionExample{{
-				Value: "https://example.com",
-				Help:  "Connect to example.com.",
-			}, {
-				Value: "https://user:pass@example.com",
-				Help:  "Connect to example.com using a username and password.",
-			}},
 		}, {
 			Name: "headers",
 			Help: `Set HTTP headers for all transactions.

backend/sftp/sftp.go

@@ -56,12 +56,8 @@ func init() {
 		NewFs:       NewFs,
 		Options: []fs.Option{{
 			Name:     "host",
-			Help:     "SSH host to connect to.",
+			Help:     "SSH host to connect to.\n\nE.g. \"example.com\".",
 			Required: true,
-			Examples: []fs.OptionExample{{
-				Value: "example.com",
-				Help:  "Connect to example.com.",
-			}},
 		}, {
 			Name: "user",
 			Help: "SSH username, leave blank for current username, " + currentUser + ".",

backend/webdav/webdav.go

@@ -70,12 +70,8 @@ func init() {
 		NewFs:       NewFs,
 		Options: []fs.Option{{
 			Name:     "url",
-			Help:     "URL of http host to connect to.",
+			Help:     "URL of http host to connect to.\n\nE.g. https://example.com.",
 			Required: true,
-			Examples: []fs.OptionExample{{
-				Value: "https://example.com",
-				Help:  "Connect to example.com.",
-			}},
 		}, {
 			Name: "vendor",
 			Help: "Name of the Webdav site/service/software you are using.",