Merge pull request #5529 from bsipocz/coordinates_fix_sgr_url

Update links in Sgr example

examples/coordinates/plot_sgr-coordinate-frame.py

@@ -28,7 +28,7 @@
   http://arxiv.org/abs/astro-ph/0304198
 * Law & Majewski 2010, "The Sagittarius Dwarf Galaxy: A Model for Evolution in a
   Triaxial Milky Way Halo", http://arxiv.org/abs/1003.1132
-* David Law's Sgr info page http://www.astro.virginia.edu/~srm4n/Sgr/
+* David Law's Sgr info page http://www.stsci.edu/~dlaw/Sgr/
 
 -------------------
 
@@ -70,7 +70,7 @@ class Sagittarius(coord.BaseCoordinateFrame):
     of the Sagittarius dwarf galaxy, as described in
         http://adsabs.harvard.edu/abs/2003ApJ...599.1082M
     and further explained in
-        http://www.astro.virginia.edu/~srm4n/Sgr/.
+        http://www.stsci.edu/~dlaw/Sgr/.
 
     Parameters
     ----------