spatial_standards_raster: improve note on warnings

Author: florisvdh

content/tutorials/spatial_standards_raster/index.Rmd

@@ -14,8 +14,8 @@ output:
 
 _General note: the way the `raster` package handles coordinate reference systems has just recently (at the time of writing) become compliant with recent GDAL 3 and PROJ >= 6 versions._
 _At the time of writing, it was necessary to use the current development version of `raster` ([link](https://github.com/rspatial/raster))._
-_Many packages (like `raster`) depend on `rgdal` to handle CRS objects, and several still rely on the use of PROJ.4 strings (unsupported in GDAL 3 and PROJ >= 6)._
-_Therefore you may get a decent portion of warnings (from `rgdal`) when running the below code, but you can safely ignore them._
+_During the current transition period of supporting both old and new PROJ/GDAL, you may get a decent portion of proj4string-related warnings when running the below code (as seen below), but you can safely ignore them._
+_For more information, see the [CRS tutorial](../spatial_crs_coding/)._
 
 ```{r include = FALSE}
 library(knitr)

content/tutorials/spatial_standards_raster/index.md

@@ -14,8 +14,8 @@ output:
 
 _General note: the way the `raster` package handles coordinate reference systems has just recently (at the time of writing) become compliant with recent GDAL 3 and PROJ >= 6 versions._
 _At the time of writing, it was necessary to use the current development version of `raster` ([link](https://github.com/rspatial/raster))._
-_Many packages (like `raster`) depend on `rgdal` to handle CRS objects, and several still rely on the use of PROJ.4 strings (unsupported in GDAL 3 and PROJ >= 6)._
-_Therefore you may get a decent portion of warnings (from `rgdal`) when running the below code, but you can safely ignore them._
+_During the current transition period of supporting both old and new PROJ/GDAL, you may get a decent portion of proj4string-related warnings when running the below code (as seen below), but you can safely ignore them._
+_For more information, see the [CRS tutorial](../spatial_crs_coding/)._
 
 This tutorial uses a few basic functions from the
 [dplyr](https://dplyr.tidyverse.org) and