Fixed comments in Archives.gitignore

Global/Archives.gitignore

-# it's better to unpack these files and commit the raw source
-# git has its own built in compression methods
+# It's better to unpack these files and commit the raw source because
+# git has its own built in compression methods.
 *.7z
 *.dmg
 *.gz
@@ -9,4 +9,4 @@
 *.tar
 *.tar.gz
 *.zip
-*.bzip
+*.bzip
\ No newline at end of file