manuals: improve the width of diagrams

Better for EPUB output in particular
- Make some diagrams wider when necessary
- Remove ":align: center" when we have ":width: 100%"
- Update the standards.md files to mention this

(From yocto-docs rev: 848ba7bd8984cc3f4bf6b818259865011cde0476)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/documentation/standards.md b/documentation/standards.md
index d288376828..81aff5f193 100644
--- a/documentation/standards.md
+++ b/documentation/standards.md
@@ -48,8 +48,14 @@ To include a screenshot in PNG format:
     .. image:: figures/user-configuration.png
        :align: center
 
-Depending on the size of the image, you may also shrink it
-to prevent it from filling the whole page width:
+A diagram with many details usually needs to use
+the whole page width to be readable on all media.
+In this case, the `:align:` directive is unnecessary:
+
+       :scale: 100%
+
+Conversely, you may also shrink some images to
+to prevent them from filling the whole page width:
 
        :scale: 50%