SWDEV-286322 - add command line need to run in comment

Change-Id: I8489eb79ce781161415e7d5a461f20b74b9314cd

.gitattributes

@@ -10,7 +10,9 @@
 *.hpp text eol=lf
 *.txt text eol=lf
 
-# auto remove white space
+# Define files to support auto-remove trailing white space
+# Need to run the command below, before add modified file(s) to the staging area
+# git config filter.trimspace.clean 'sed -e "s/[[:space:]]*$//g"'
 *.cpp filter=trimspace
 *.c filter=trimspace
 *.h filter=trimspacecpp