Add link to Python glossary page at /doc/ (#1650)
Add link to Python glossary page at /doc/ (#1650)

Fixes #1620
proevo/pythondotorg,proevo/pythondotorg,manhhomienbienthuy/pythondotorg,python/pythondotorg,proevo/pythondotorg,proevo/pythondotorg,python/pythondotorg,manhhomienbienthuy/pythondotorg,python/pythondotorg,manhhomienbienthuy/pythondotorg,manhhomienbienthuy/pythondotorg,python/pythondotorg