This commit fixes indentations in releasenotes. Due to the indentations,
the html contents are rendered as block quotes which is awkward.
Change-Id: Ia9f271ead6a6e3fb90afc935771e8da4d8990c3c
This commit tidies up releasenotes. Originally, release note files are
in one directory. So, when I see the directory, I feel ""what a mess!".
So this commit tries to improve it.
Change-Id: I54c14a61ebcda16268cf543079c7739def5ebadb