Fixed broken links to Oracle docs.

docs/ref/contrib/gis/functions.txt

@@ -194,7 +194,7 @@ south = ``π``; west = ``3π/2``.
 .. class:: BoundingCircle(expression, num_seg=48, **extra)
 
 *Availability*: `PostGIS <https://postgis.net/docs/ST_MinimumBoundingCircle.html>`__,
-`Oracle <https://docs.oracle.com/database/121/SPATL/GUID-82A61626-BB64-4793-B53D-A0DBEC91831A.htm#SPATL1554>`_
+`Oracle <https://docs.oracle.com/database/121/SPATL/sdo_geom-sdo_mbc.htm#SPATL1554>`_
 
 Accepts a single geographic field or expression and returns the smallest circle
 polygon that can fully contain the geometry.

docs/ref/contrib/gis/geoquerysets.txt

@@ -859,5 +859,5 @@ Example::
 
 .. rubric:: Footnotes
 .. [#fnde9im] *See* `OpenGIS Simple Feature Specification For SQL <http://www.opengis.org/docs/99-049.pdf>`_, at Ch. 2.1.13.2, p. 2-13 (The Dimensionally Extended Nine-Intersection Model).
-.. [#fnsdorelate] *See* `SDO_RELATE documentation <https://docs.oracle.com/database/121/SPATL/GUID-97C17C18-F05E-49B4-BE11-E89B972E2A02.htm#SPATL1039>`_, from the Oracle Spatial and Graph Developer's Guide.
+.. [#fnsdorelate] *See* `SDO_RELATE documentation <https://docs.oracle.com/database/121/SPATL/sdo_relate.htm#SPATL1039>`_, from the Oracle Spatial and Graph Developer's Guide.
 .. [#fncovers] For an explanation of this routine, read `Quirks of the "Contains" Spatial Predicate <http://lin-ear-th-inking.blogspot.com/2007/06/subtleties-of-ogc-covers-spatial.html>`_ by Martin Davis (a PostGIS developer).