Parser: Fix special markdown characters in tables

A '|' indicates a cell in the table, but it is also a character
in the device string. ex: Acpi(PNP0A08,0)/Pci(1|0)/Pci(0|0).

Escape the '|' to print markdown tables correctly.

Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>