docs: start paragraph before closing it

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>

docs/meson.html

@@ -192,6 +192,7 @@ in using them.
 <code>-D${lang}_link_args</code>. Among the benefits of these options
 is that they are guaranteed to persist across rebuilds and reconfigurations.
 </p>
+<p>
 This example sets -fmax-errors for compiling C sources and -DMAGIC=123
 for C++ sources:
 </p>