[vala] posix: Correct documentation comment for crypt()

[Rico Tzschichholz <ricotz src gnome org>]

commit 94acede2c36d1e7c8db5296af4be753abf931823
Author: Chris Daley <chebizarro gmail com>
Date:   Thu Jun 16 12:16:40 2016 +0100

    posix: Correct documentation comment for crypt()
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767047

 vapi/posix.vapi |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/vapi/posix.vapi b/vapi/posix.vapi
index b142a36..3472112 100644
--- a/vapi/posix.vapi
+++ b/vapi/posix.vapi
@@ -1916,10 +1916,13 @@ namespace Posix {
        [Version (deprecated_since = "POSIX.2", replacement = "termios ECHO flag")]
        [CCode (cheader_filename = "unistd.h")]
        public unowned string getpass (string promt);
-       /** To expose Posix crypt() GNU's libc and others require the feature test
-        *  macro _XOPEN_SOURCE to be defined. See man 3 crypt
-        *  A VAPI is unable to define and emit this macro before all include files
-        *  Instead use valac -X -D_XOPEN_SOURCE
+       /**
+        * Encodes a string
+        *
+        * To expose Posix crypt() GNU's libc and others require the feature test
+        * macro _XOPEN_SOURCE to be defined. See man 3 crypt.
+        * A VAPI is unable to define and emit this macro before all include files
+        * Instead use valac -X -D_XOPEN_SOURCE
         */
        [CCode (cheader_filename = "unistd.h")]
        public unowned string crypt (string key, string salt);