[gcab] trivial: Fix spelling issues in two introspection headers

[Richard Hughes <rhughes src gnome org>]

commit de0855d414c1913d29545383e53549cd6c1199f3
Author: Richard Hughes <richard hughsie com>
Date:   Thu Dec 14 21:31:10 2017 +0000

    trivial: Fix spelling issues in two introspection headers

 libgcab/gcab-cabinet.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgcab/gcab-cabinet.c b/libgcab/gcab-cabinet.c
index 9960184..346a70f 100644
--- a/libgcab/gcab-cabinet.c
+++ b/libgcab/gcab-cabinet.c
@@ -486,7 +486,7 @@ gcab_cabinet_load (GCabCabinet *self,
  * gcab_cabinet_extract:
  * @cabinet: a #GCabCabinet
  * @path: the path to extract files
- * @file_callback: (allow-none) (scope call) (closure user_data): an optionnal #GCabFile callback,
+ * @file_callback: (allow-none) (scope call) (closure user_data): an optional #GCabFile callback,
  *     return %FALSE to filter out or skip files.
  * @progress_callback: (allow-none) (scope call) (closure user_data): a progress callback
  * @user_data: (closure): callback data
@@ -535,7 +535,7 @@ gcab_cabinet_extract (GCabCabinet *self,
  * gcab_cabinet_extract_simple:
  * @cabinet: a #GCabCabinet
  * @path: the path to extract files
- * @file_callback: (allow-none) (scope call) (closure user_data): an optionnal #GCabFile callback,
+ * @file_callback: (allow-none) (scope call) (closure user_data): an optional #GCabFile callback,
  *     return %FALSE to filter out or skip files.
  * @user_data: (closure): callback data
  * @cancellable: (allow-none): optional #GCancellable object,