Use the canonical host for two urls on the OpenSSL website (#3219)

diff --git a/docs/development/getting-started.rst b/docs/development/getting-started.rst
index ea21f5e..dc55893 100644
--- a/docs/development/getting-started.rst
+++ b/docs/development/getting-started.rst
@@ -120,7 +120,7 @@
 
 .. _`Homebrew`: http://brew.sh
 .. _`MacPorts`: https://www.macports.org
-.. _`OpenSSL`: https://openssl.org
+.. _`OpenSSL`: https://www.openssl.org
 .. _`pytest`: https://pypi.python.org/pypi/pytest
 .. _`tox`: https://pypi.python.org/pypi/tox
 .. _`virtualenv`: https://pypi.python.org/pypi/virtualenv