Fix missing word in docuentation of guestfs_readdir.

diff --git a/src/generator.ml b/src/generator.ml
index 96a5847..1e7e90c 100755 (executable)
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -3152,7 +3152,7 @@ Unknown file type
 
 =item '?'
 
-The L<readdir(3)> returned a C<d_type> field with an
+The L<readdir(3)> call returned a C<d_type> field with an
 unexpected value
 
 =back