Update Documentation to roxygen standard

[BadgerOnABike]

Upon docs being updated, I will push to dev for publication testing.

Updating the following:

• [x] BEcalc.r
• [x] BROScalc.r
• [x] buiCalc.R
• [x] C6calc.r
• [x] CFBcalc.r
• [x] cffdrs-package.R
• [x] dcCalc.R
• [x] direction.r
• [x] DISTtcalc.r
• [x] dmcCalc.R
• [x] fbp.r
• [x] FBPcalc.r
• [x] fbpRaster.r
• [x] ffmcCalc.R
• [x] FIcalc.r
• [x] fireSeason.r
• [x] FMCcalc.r
• [x] FROScalc.r
• [x] fwi.r
• [x] fwiCalc.R
• [x] fwiRaster.r
• [x] getvaluesblock_stackfix.r
• [x] gfmc.r
• [x] gfmcRaster.R
• [x] hffmc.r
• [x] hffmcRaster.r
• [x] ISIcalc.r
• [x] LBcalc.r
• [x] LBtcalc.r
• [x] lros.r
• [x] pros.r
• [x] ROScalc.r
• [x] ROStcalc.r
• [x] ROSthetacalc.r
• [x] sdmc.r
• [x] SFCcalc.r
• [x] Slopecalc.r
• [x] TFCcalc.r
• [x] winter_DC.r

[BadgerOnABike]

Docs pushed to dev.