links in qepcad doc

src/sage/interfaces/qepcad.py

@@ -38,13 +38,10 @@
 such, it does not cover several issues that are very important to use
 QEPCAD efficiently, such as variable ordering, the efficient use of
 the alternate quantifiers and ``_root_`` expressions, the
-``measure-zero-error`` command, etc.  For more information on
-QEPCAD, see the online documentation at
-\url{http://www.cs.usna.edu/~qepcad/B/QEPCAD.html} and Chris Brown's
-tutorial handout and slides from
-\url{http://www.cs.usna.edu/~wcbrown/research/ISSAC04/Tutorial.html}.
-(Several of the examples in this documentation came from these
-sources.)
+``measure-zero-error`` command, etc.  For more information on QEPCAD,
+see the `online documentation <https://www.usna.edu/Users/cs/wcbrown/qepcad/B/QEPCAD.html>`_
+and Chris Brown's `tutorial handout <https://www.usna.edu/Users/cs/wcbrown/research/ISSAC04/Tutorial.html>`_.
+(Several of the examples in this documentation came from these sources.)
 
 The examples below require that the optional qepcad package is installed.
 
@@ -596,6 +593,7 @@
 
 - Carl Witty (2008-03): initial version
 - Thierry Monteil (2015-07) repackaging + noncommutative doctests.
+
 """
 # ****************************************************************************
 #       Copyright (C) 2008 Carl Witty <[email protected]>