dev-manual: bblock: use warning block instead of attention

Sphinx recommends using warning and note here:
https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#directives

Suggested-by: Quentin Schulz <quentin.schulz@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
(From yocto-docs rev: cafa551d0927f56854f823e51f3de690f17423cd)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit ed49067f172637d38d470a864feed2a02bd84c66)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/documentation/dev-manual/bblock.rst b/documentation/dev-manual/bblock.rst
index 68292903ba..605bb75655 100644
--- a/documentation/dev-manual/bblock.rst
+++ b/documentation/dev-manual/bblock.rst
@@ -19,7 +19,7 @@ recipes that depend on it.
 To prevent this, use ``bblock`` to lock specific tasks or recipes to
 specific signatures, forcing BitBake to use the sstate cache for them.
 
-.. attention::
+.. warning::
 
    Use ``bblock`` only during the development phase.