[libgdata] docs: Remove a dead link from the HACKING file

[Philip Withnall <pwithnall src gnome org>]

commit f5f4d75bc63fb57bf344ff1018731e12d695772e
Author: Philip Withnall <philip tecnocode co uk>
Date:   Sun May 3 23:48:35 2015 +0100

    docs: Remove a dead link from the HACKING file
    
    https://bugzilla.gnome.org/show_bug.cgi?id=664353

 HACKING |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/HACKING b/HACKING
index 587b5b8..69177c2 100644
--- a/HACKING
+++ b/HACKING
@@ -138,7 +138,7 @@ In general, use common sense. However, there are some specific cases where a sta
  - For boolean setters use foo_bar_set_is_baz, rather than foo_bar_set_baz.
 
  - In general, try to keep API named similarly to the actual GData API constructs. In certain cases, 
however, it might make more sense to rename pieces
-   of API to be less cryptic (e.g. "timezone" instead of "ctz": 
http://code.google.com/apis/calendar/docs/2.0/reference.html#Parameters).
+   of API to be less cryptic (e.g. "timezone" instead of "ctz").
 
 Deprecating public API
 ======================