Rast function name change

Author: sstevens2

episodes/01-raster-structure.Rmd

@@ -326,7 +326,7 @@ nlyr(DSM_HARV)
 
 However, raster data can also be multi-band, meaning that one raster file
 contains data for more than one variable or time period for each cell. By
-default the `raster()` function only imports the first band in a raster
+default the `rast()` function only imports the first band in a raster
 regardless of whether it has one or more bands. Jump to a later episode in
 this series for information on working with multi-band rasters:
 [Work with Multi-band Rasters in R](05-raster-multi-band-in-r/).