STP Rule 4—All the other ports in all the switches (VLAN-specific) must be placed in blocking mode. The rule only applies to ports that connect to other bridges or switches. STP does not affect ports that connect to workstations or PCs. These ports remain forwarded.
In fact, PC attached ports also counted in STP. The link between the PC and the switch port is still a segment. Since general PCs do not send BPDUs, the switch port itself where the PC attached to becomes the "Designated Port" of this tiny segment, after two "Forward Delay"s by definition. That's how PCs can send and receive traffic through the switch later.
I think the last two sentences should be removed.
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Understanding and Configuring Spanning Tree Protocol (STP) on Catalyst Switches
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