Move all references of old url to the new address (#622)

diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index 8e2cd62..2c8c060 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -210,7 +210,7 @@
   }
   else if (unlikely (u == 0x0A51u))
   {
-    /* https://github.com/behdad/harfbuzz/issues/524 */
+    /* https://github.com/harfbuzz/harfbuzz/issues/524 */
     cat = OT_M;
     pos = POS_BELOW_C;
   }
@@ -220,9 +220,9 @@
   else if (unlikely (u == 0x11301u || u == 0x11303u)) cat = OT_SM;
   else if (unlikely (u == 0x1133cu)) cat = OT_N;
 
-  else if (unlikely (u == 0x0AFBu)) cat = OT_N; /* https://github.com/behdad/harfbuzz/issues/552 */
+  else if (unlikely (u == 0x0AFBu)) cat = OT_N; /* https://github.com/harfbuzz/harfbuzz/issues/552 */
 
-  else if (unlikely (u == 0x0980u)) cat = OT_PLACEHOLDER; /* https://github.com/behdad/harfbuzz/issues/538 */
+  else if (unlikely (u == 0x0980u)) cat = OT_PLACEHOLDER; /* https://github.com/harfbuzz/harfbuzz/issues/538 */
   else if (unlikely (u == 0x17C6u)) cat = OT_N; /* Khmer Bindu doesn't like to be repositioned. */
   else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x2010u, 0x2011u)))
 				    cat = OT_PLACEHOLDER;
@@ -691,7 +691,7 @@
   const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data;
   hb_glyph_info_t *info = buffer->info;
 
-  /* https://github.com/behdad/harfbuzz/issues/435#issuecomment-335560167
+  /* https://github.com/harfbuzz/harfbuzz/issues/435#issuecomment-335560167
    * // For compatibility with legacy usage in Kannada,
    * // Ra+h+ZWJ must behave like Ra+ZWJ+h...
    */