Fix a typo in walreceiver.c

[Bharath Rupireddy]

Hi,

Attaching a tiny patch to fix a typo - replace primary_slotname with
correct parameter name primary_slot_name in walreceiver.c code
comments.

Regards,
Bharath Rupireddy.

v1-0001-Replace-primary_slotname-with-primary_slot_name.patch
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