SDK doc change: add a note in download page for those updating tools only.
-rw-r--r-- 4200 buildspec.mk.default
-rw-r--r-- 7243 cleanspec.mk
drwxr-xr-x - core
-rw-r--r-- 27581 envsetup.sh
drwxr-xr-x - history
drwxr-xr-x - libs
drwxr-xr-x - target
drwxr-xr-x - tools