Add documentation to more chip-tool optional arguments. (#18612)

* Add documentation to more chip-tool optional arguments.

* Address review comment.

examples/chip-tool/commands/common/CHIPCommand.h

@@ -58,9 +58,14 @@ class CHIPCommand : public Command
     CHIPCommand(const char * commandName, CredentialIssuerCommands * credIssuerCmds) :
         Command(commandName), mCredIssuerCmds(credIssuerCmds)
     {
-        AddArgument("paa-trust-store-path", &mPaaTrustStorePath);
-        AddArgument("commissioner-name", &mCommissionerName);
-        AddArgument("commissioner-nodeid", 0, UINT64_MAX, &mCommissionerNodeId);
+        AddArgument("paa-trust-store-path", &mPaaTrustStorePath,
+                    "Path to directory holding PAA certificate information.  Can be absolute or relative to the current working "
+                    "directory.");
+        AddArgument(
+            "commissioner-name", &mCommissionerName,
+            "Name of fabric to use. Valid values are \"alpha\", \"beta\", \"gamma\", and integers greater than or equal to 4.");
+        AddArgument("commissioner-nodeid", 0, UINT64_MAX, &mCommissionerNodeId,
+                    "The node id to use for chip-tool.  If not provided, kTestControllerNodeId (112233, 0x1B669) will be used.");
 #if CHIP_CONFIG_TRANSPORT_TRACE_ENABLED
         AddArgument("trace_file", &mTraceFile);
         AddArgument("trace_log", 0, 1, &mTraceLog);