[glib] gmain: Fix some minor typos in the documentation

[Philip Withnall <pwithnall src gnome org>]

commit 9dd8e833ef4504396193e3850c8a759fe463f618
Author: Philip Withnall <withnall endlessm com>
Date:   Mon Mar 26 14:48:12 2018 +0100

    gmain: Fix some minor typos in the documentation
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    Reviewed-by: nobody

 glib/gmain.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/glib/gmain.c b/glib/gmain.c
index 227168a0f..ee2f29e1b 100644
--- a/glib/gmain.c
+++ b/glib/gmain.c
@@ -4697,7 +4697,7 @@ g_timeout_source_new (guint interval)
  * The scheduling granularity/accuracy of this timeout source will be
  * in seconds.
  *
- * The interval given in terms of monotonic time, not wall clock time.
+ * The interval given is in terms of monotonic time, not wall clock time.
  * See g_get_monotonic_time().
  *
  * Returns: the newly-created timeout source
@@ -4751,7 +4751,7 @@ g_timeout_source_new_seconds (guint interval)
  * context. You can do these steps manually if you need greater control or to
  * use a custom main context.
  *
- * The interval given in terms of monotonic time, not wall clock time.
+ * The interval given is in terms of monotonic time, not wall clock time.
  * See g_get_monotonic_time().
  * 
  * Returns: the ID (greater than 0) of the event source.