Fix capitalization of generated flags

docs/cmd/kn_service_create.md

@@ -57,12 +57,12 @@ kn service create NAME --image IMAGE [flags]
   -l, --label stringArray         Service label to set. name=value; you may provide this flag any number of times to set multiple labels. To unset, specify the label name followed by a "-" (e.g., name-).
       --limits-cpu string         The limits on the requested CPU (e.g., 1000m).
       --limits-memory string      The limits on the requested memory (e.g., 1024Mi).
-      --lock-to-digest            keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision) (default true)
+      --lock-to-digest            Keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision) (default true)
       --max-scale int             Maximal number of replicas.
       --min-scale int             Minimal number of replicas.
       --mount stringArray         Mount a ConfigMap (prefix cm: or config-map:), a Secret (prefix secret: or sc:), or an existing Volume (without any prefix) on the specified directory. Example: --mount /mydir=cm:myconfigmap, --mount /mydir=secret:mysecret, or --mount /mydir=myvolume. When a configmap or a secret is specified, a corresponding volume is automatically generated. You can use this flag multiple times. For unmounting a directory, append "-", e.g. --mount /mydir-, which also removes any auto-generated volume.
   -n, --namespace string          Specify the namespace to operate in.
-      --no-lock-to-digest         do not keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision)
+      --no-lock-to-digest         Do not keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision)
       --no-wait                   Create service and don't wait for it to become ready.
   -p, --port int32                The port where application listens on.
       --pull-secret string        Image pull secret to set. An empty argument ("") clears the pull secret. The referenced secret must exist in the service's namespace.

docs/cmd/kn_service_update.md

@@ -52,12 +52,12 @@ kn service update NAME [flags]
   -l, --label stringArray         Service label to set. name=value; you may provide this flag any number of times to set multiple labels. To unset, specify the label name followed by a "-" (e.g., name-).
       --limits-cpu string         The limits on the requested CPU (e.g., 1000m).
       --limits-memory string      The limits on the requested memory (e.g., 1024Mi).
-      --lock-to-digest            keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision) (default true)
+      --lock-to-digest            Keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision) (default true)
       --max-scale int             Maximal number of replicas.
       --min-scale int             Minimal number of replicas.
       --mount stringArray         Mount a ConfigMap (prefix cm: or config-map:), a Secret (prefix secret: or sc:), or an existing Volume (without any prefix) on the specified directory. Example: --mount /mydir=cm:myconfigmap, --mount /mydir=secret:mysecret, or --mount /mydir=myvolume. When a configmap or a secret is specified, a corresponding volume is automatically generated. You can use this flag multiple times. For unmounting a directory, append "-", e.g. --mount /mydir-, which also removes any auto-generated volume.
   -n, --namespace string          Specify the namespace to operate in.
-      --no-lock-to-digest         do not keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision)
+      --no-lock-to-digest         Do not keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision)
       --no-wait                   Update service and don't wait for it to become ready.
   -p, --port int32                The port where application listens on.
       --pull-secret string        Image pull secret to set. An empty argument ("") clears the pull secret. The referenced secret must exist in the service's namespace.

pkg/kn/commands/service/configuration_edit_flags.go

@@ -152,7 +152,7 @@ func (p *ConfigurationEditFlags) addSharedFlags(command *cobra.Command) {
 	p.markFlagMakesRevision("revision-name")
 
 	flags.AddBothBoolFlagsUnhidden(command.Flags(), &p.LockToDigest, "lock-to-digest", "", true,
-		"keep the running image for the service constant when not explicitly specifying "+
+		"Keep the running image for the service constant when not explicitly specifying "+
 			"the image. (--no-lock-to-digest pulls the image tag afresh with each new revision)")
 	// Don't mark as changing the revision.
 	command.Flags().StringVar(&p.ServiceAccountName,

pkg/kn/flags/bool.go

@@ -18,6 +18,8 @@ import (
 	"fmt"
 	"strconv"
 	"strings"
+	"unicode"
+	"unicode/utf8"
 
 	"github.com/spf13/pflag"
 )
@@ -30,8 +32,7 @@ func AddBothBoolFlagsUnhidden(f *pflag.FlagSet, p *bool, name, short string, val
 	negativeName := negPrefix + name
 
 	f.BoolVarP(p, name, short, value, usage)
-	f.Bool(negativeName, !value, "do not "+usage)
-
+	f.Bool(negativeName, !value, "Do not "+firstCharToLower(usage))
 }
 
 // AddBothBoolFlags adds the given flag in both `--foo` and `--no-foo` variants.
@@ -108,3 +109,8 @@ func checkExplicitFalse(f *pflag.Flag, betterFlag string) error {
 	}
 	return nil
 }
+
+func firstCharToLower(s string) string {
+	r, n := utf8.DecodeRuneInString(s)
+	return string(unicode.ToLower(r)) + s[n:]
+}