MCLR=Master Clear pin External Reset.
The #3 drawing is for in-circuit serial programming and should include a switch to isolate (disconnect) the capacitor when programming and connect when the circuit is in use in an electrically noisy circuit (especially with inductive loads. The capacitor will insure the device does not reset unintentionally.
The Device will not program if the capacitor is there. Or, it will program if Vpp is connected directly to/MCLR and R1 is at least 10k.
It looks like the Microchip drawing is wrong.
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