[glib] docs: Add Markdown backticks around `/dev/null` in a few places

[Philip Withnall <pwithnall src gnome org>]

commit 565d8fa1ee5884eeb79a420878d3b60f5a2adfbb
Author: Philip Withnall <withnall endlessm com>
Date:   Thu Feb 8 16:39:32 2018 +0000

    docs: Add Markdown backticks around `/dev/null` in a few places
    
    This improves the formatting of the documentation ever so slightly.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    Reviewed-by: nobody

 gio/gioenums.h | 6 +++---
 glib/gspawn.c  | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/gio/gioenums.h b/gio/gioenums.h
index c6ee8c433..bc844b9b9 100644
--- a/gio/gioenums.h
+++ b/gio/gioenums.h
@@ -1816,12 +1816,12 @@ typedef enum /*< flags >*/ {
  *   spawned process that can be accessed with
  *   g_subprocess_get_stdout_pipe().
  * @G_SUBPROCESS_FLAGS_STDOUT_SILENCE: silence the stdout of the spawned
- *   process (ie: redirect to /dev/null).
+ *   process (ie: redirect to `/dev/null`).
  * @G_SUBPROCESS_FLAGS_STDERR_PIPE: create a pipe for the stderr of the
  *   spawned process that can be accessed with
  *   g_subprocess_get_stderr_pipe().
  * @G_SUBPROCESS_FLAGS_STDERR_SILENCE: silence the stderr of the spawned
- *   process (ie: redirect to /dev/null).
+ *   process (ie: redirect to `/dev/null`).
  * @G_SUBPROCESS_FLAGS_STDERR_MERGE: merge the stderr of the spawned
  *   process with whatever the stdout happens to be.  This is a good way
  *   of directing both streams to a common log file, for example.
@@ -1832,7 +1832,7 @@ typedef enum /*< flags >*/ {
  *
  * Flags to define the behaviour of a #GSubprocess.
  *
- * Note that the default for stdin is to redirect from /dev/null.  For
+ * Note that the default for stdin is to redirect from `/dev/null`.  For
  * stdout and stderr the default are for them to inherit the
  * corresponding descriptor from the calling process.
  *
diff --git a/glib/gspawn.c b/glib/gspawn.c
index 512257050..89824d176 100644
--- a/glib/gspawn.c
+++ b/glib/gspawn.c
@@ -616,7 +616,7 @@ g_spawn_sync (const gchar          *working_directory,
  * standard error. If you use this flag, @standard_error must be %NULL.
  * %G_SPAWN_CHILD_INHERITS_STDIN means that the child will inherit the parent's
  * standard input (by default, the child's standard input is attached to
- * /dev/null). If you use this flag, @standard_input must be %NULL.
+ * `/dev/null`). If you use this flag, @standard_input must be %NULL.
  * %G_SPAWN_FILE_AND_ARGV_ZERO means that the first element of @argv is
  * the file to execute, while the remaining elements are the actual
  * argument vector to pass to the file. Normally g_spawn_async_with_pipes()
@@ -653,8 +653,8 @@ g_spawn_sync (const gchar          *working_directory,
  * when they are no longer in use. If these parameters are %NULL, the
  * corresponding pipe won't be created.
  *
- * If @standard_input is NULL, the child's standard input is attached to 
- * /dev/null unless %G_SPAWN_CHILD_INHERITS_STDIN is set.
+ * If @standard_input is %NULL, the child's standard input is attached to
+ * `/dev/null` unless %G_SPAWN_CHILD_INHERITS_STDIN is set.
  *
  * If @standard_error is NULL, the child's standard error goes to the same 
  * location as the parent's standard error unless %G_SPAWN_STDERR_TO_DEV_NULL