Using High Endurance Flash Memory on PIC processor
this document
AN1673
Using the PIC16F1XXX High-Endurance Flash (HEF) Block

found here ... 
http://ww1.microchip.com/downloads/en/AppNotes/00001673A.pdf

states
It is also worth noting that each high-endurance cell
can be used only to hold an 8-bit value, whereas the
standard Flash memory will hold 14 bits of information
as per the traditional PIC MCU mid-range program
memory array design.

there is a lot of information in this document

table 2-1, of the document that you linked, shows that addressing locations 0180h-01FFh in flash memory gives access to the high endurance flash area in your device.