Add some comments to the script

scripts/build.sh

@@ -16,6 +16,9 @@ fi
 
 if [[ -f ${BUILD_DIR}/CONTRIBUTING.md ]]; then
 
+  # Copy the specified file into a temporary file.
+  # Copies from the first line until the first comment.
+  # This script overwrites the remainder of the original contents.
   sed '/<!---/q' content/contributing/opencue/contributing.md \
     > contributing.tmp
 
@@ -29,6 +32,7 @@ if [[ -f ${BUILD_DIR}/CONTRIBUTING.md ]]; then
   # Update the publication date for the page
   sed -i '4s/20[0-9]\{2\}-[0-9]\{1,2\}-[0-9]\{1,2\}/'${LAST_UPDATE}'/' contributing.tmp
 
+  # Copy most of the source file into the temporary file
   tail -n +2 ${BUILD_DIR}/CONTRIBUTING.md >> contributing.tmp
 
   mv contributing.tmp content/contributing/opencue/contributing.md