announcements: add missing newline before before heading

[gotmax23]

We have trim_blocks enabled in the Jinja environment, so we need an
extra newline here.

[webknjaz]

@gotmax23 does this leave one LF in the end? I'm always confused by how Jinja squashes stuff with those trims left and right.. I also need to figure out a related problem elsewhere...

[gotmax23]

@gotmax23 does this leave one LF in the end? I'm always confused by how Jinja squashes stuff with those trims left and right.. I also need to figure out a related problem elsewhere...

trim_blocks removes a newline immediately following the end of a block. {% endif %} ends off the line so we need an extra newline to have one blank line before the heading, as the first newline is stripped out. You can see what it looks like in the test_data files that I just regenerated.

[webknjaz]

Thanks for the explanation!

[felixfontein]

Thanks!