README/CONTRIBUTING: Markdown fixes

Found while being parsed by doxygen (when used recursively), this fixes
the markdown bits as to be displayed properly.
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

CONTRIBUTING.md

@@ -37,7 +37,7 @@ fork the core Weston repository, push your changes to a branch in your new
 repository, and then submit these patches for review through a merge request.
 
 Weston formerly accepted patches via `git-send-email`, sent to
-**wayland-devel@lists.freedesktop.org**; these were
+**wayland-devel\@lists.freedesktop.org**; these were
 [tracked using Patchwork](https://patchwork.freedesktop.org/projects/wayland/).
 Some old patches continue to be sent this way, and we may accept small new
 patches sent to the list, but please send all new patches through GitLab merge

README.md

@@ -242,18 +242,22 @@ user visible API changes, thus should be not considered part of the API version.
 
 All new symbols should be guarded by the macro like the example given below:
 
+~~~~
 #if REQUIRE_LIBWESTON_API_VERSION >= 0x0101
 
 bool
 weston_ham_sandwich(void);
 
 #endif
+~~~~
 
 In order to use the said symbol, the one will have a similar code in their
 configure.ac:
 
+~~~~
 PKG_CHECK_MODULES(LIBWESTON, [libweston-1 >= 1.1])
 AC_DEFINE(REQUIRE_LIBWESTON_API_VERSION, [0x0101])
+~~~~
 
 If the user is _not_ interested in forward compatibility, they can use 0xffff
 or similar high value. Yet doing so is not recommended.