Breaks add_header alt-svc

[skygunner]

add_header alt-svc 'h3=":443"; ma=86400, h3-29=":443"; ma=86400' always;

will be break into 3 lines and like this:

add_header alt-svc 'h3=":443";
ma=86400, h3-29=":443";
ma=86400' always;

Though it passes the nginx conf test but SSL will break.