fixed gtk-doc generation in 2.2 branch

git-svn-id: https://svn.code.sf.net/p/gphoto/code/branches/libgphoto2-2_2/libgphoto2@8791 67ed7778-7388-44ab-90cf-0a291f65f57c

libgphoto2_port/libgphoto2_port/gphoto2-port-info-list.c

@@ -68,7 +68,8 @@ struct _GPPortInfoList {
 #define CHECK_NULL(x) {if (!(x)) return (GP_ERROR_BAD_PARAMETERS);}
 #define CR(x)         {int r=(x);if (r<0) return (r);}
 
-/** IOLIBDIR_ENV:
+/**
+ * IOLIBDIR_ENV:
  *
  * Name of the environment variable which may contain the path where
  * to look for the IO libs. If this environment variable is not defined,