doc: Make Meson yelp-build invocation compatible with older versions

Older versions of yelp-build like the one in Debian 11 do not allow
permuting arguments, so all options (in this case -o) must appear
before all positional parameters.

Signed-off-by: Simon McVittie <smcv@collabora.com>

doc/meson.build

@@ -226,7 +226,11 @@ if ducktype.found() and yelpbuild.found()
             'C.css',
             'highlight.pack.js',
         ],
-        command: [ yelpbuild, 'html', '@INPUT@', '-o', meson.current_build_dir() ],
+        command: [
+            yelpbuild, 'html',
+            '-o', meson.current_build_dir(),
+            '@INPUT@',
+        ],
         install: true,
         install_dir: docs_dir,
     )