ci: annotate actions explaining differences from usethis output

Author: lcbrooks

.github/workflows/R-CMD-check.yaml

@@ -1,5 +1,7 @@
 # Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
 # Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+#
+# Created with usethis + edited to use API key.
 on:
   push:
     branches: [main, master]

.github/workflows/pkgdown.yaml

@@ -1,5 +1,7 @@
 # Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
 # Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+#
+# Created with usethis + edited to use API key.
 on:
   push:
     branches: [main, master]