[doc] Clarify required arguments for T&C acknowledgements

Update help text for require-tc-acknowledgements to explicitly state which
arguments must be provided when T&C acknowledgements are required. Instead
of the vague "valid T&C acknowledgements", now specifically mentions that
both tc-acknowledgements and tc-acknowledgements-version arguments are
mandatory for successful commissioning when this option is enabled.

examples/chip-tool/commands/pairing/PairingCommand.h

@@ -205,8 +205,8 @@ class PairingCommand : public CHIPCommand,
 
             AddArgument("require-tc-acknowledgements", 0, 1, &mRequireTCAcknowledgements,
                         "Indicates whether Terms and Conditions acknowledgements are required during commissioning. If set to "
-                        "true, the commissioner must provide valid T&C acknowledgements or the commissioning will fail. If false, "
-                        "the T&C acknowledgement step will be skipped.");
+                        "true, the tc-acknowledgements and tc-acknowledgements-version arguments must be provided for the "
+                        "commissioning to succeed. If false, the T&C acknowledgement step will be skipped.");
 
             AddArgument("tc-acknowledgements", 0, UINT16_MAX, &mTCAcknowledgements,
                         "Bit-field value indicating which Terms and Conditions have been accepted by the user. This value is sent "