[lldb] Fix typo in tagged-pointer syntax string (NFC) (llvm#137069)

(cherry-picked from commit cef9ed5)

Author: kastiglione

lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp

@@ -1125,7 +1125,7 @@ class CommandObjectMultiwordObjC_TaggedPointer : public CommandObjectMultiword {
       : CommandObjectMultiword(
             interpreter, "tagged-pointer",
             "Commands for operating on Objective-C tagged pointers.",
-            "class-table <subcommand> [<subcommand-options>]") {
+            "tagged-pointer <subcommand> [<subcommand-options>]") {
     LoadSubCommand(
         "info",
         CommandObjectSP(