Update SOCI rebuild DB CLI help text and doc

Removes rpull command reference from help text which support has been
removed. Aligns help text in CLI and documentation to match.

Signed-off-by: Austin Vazquez <macedonv@amazon.com>

cmd/soci/commands/rebuild_db.go

@@ -27,7 +27,13 @@ import (
 
 var RebuildDBCommand = cli.Command{
 	Name:  "rebuild-db",
-	Usage: `rebuild the artifacts database. You should use this command after "rpull" so that indices/ztocs can be discovered by commands like "soci index list", and after "index rm" when using the containerd content store so that deleted orphaned zTOCs will be forgotten`,
+	Usage: "rebuilds the artifacts database",
+	UsageText: `
+	soci [global options] rebuild-db
+
+	Use after pulling an image to discover SOCI indices/ztocs or after "index rm"
+	when using the containerd content store to clear the database of removed zTOCs.
+	`,
 	Action: func(cliContext *cli.Context) error {
 		client, ctx, cancel, err := internal.NewClient(cliContext)
 		if err != nil {

docs/cli-usage.md

@@ -61,7 +61,8 @@ soci push public.ecr.aws/soci-workshop-examples/ffmpeg:latest
 ```
 
 ### soci rebuild_db
-Use this command after image pull so that indices/ztocs can be discovered by commands like "```soci index list```", and after "```index rm```" when using the containerd content store so that deleted orphaned zTOCs will be forgotten
+Use after pulling an image to discover SOCI indices/ztocs or after "```index rm```" 
+when using the containerd content store to clear the database of removed zTOCs.
 
 **Example:** 
 ```