dev-manual: use proper note directive

For correct rendering of the note

(From yocto-docs rev: cc765028a7cd3dda6942450b3d59d283bf73a8f7)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Quentin Schulz <foss+yocto@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/common-tasks.rst

@@ -6527,7 +6527,7 @@ newest sstate cache file for each package::
 
 This command will ask you to confirm the deletions it identifies.
 
-Note::
+.. note::
 
    The duplicated sstate cache files of one package must have the same
    architecture, which means that sstate cache files with multiple