Here's some suggestion in case of doubt
  1. Open the datasheet under the Pin diagram section (Page 5)
  2. See what else your pin may have on (ADCs, Comparator etc etc)
  3. if so refer to each section of the extra module you want to disable, or see if they're already enable at POR

Here you don't have anything else than MSSP Pins... so let's see section 13 and it's related Registers.

Register 13-1: SSPSTAT
Nothing in the list seems to enable/disable the module, let's go to the next one

Register 13-2: SSPCON
SSPEN bit 5
bit 5 SSPEN: Synchronous Serial Port Enable bit
In both modes, when enabled, these pins must be properly configured as input or output

In SPI mode:
1 = Enables serial port and configures SCK, SDO, SDI and SS as the source of the serial port pins
0 = Disables serial port and configures these pins as I/O port pins

In I2 C mode:
1 = Enables the serial port and configures the SDA and SCL pins as the source of the serial port pins
0 = Disables serial port and configures these pins as I/O port pins
this bit should be =0 to disable the MSSP port, the POR values says it's already 0. Good practice to clear it yourself for safety sake, while not 100% needed.

same for all other register.. if there's any other

HTH