minor: typo correction

Author: Sam Kleinman

conf.py

@@ -120,7 +120,7 @@
     'epubpath': manual_edition_path + '.epub',
     'manual_path': meta['manual_path'],
     'translations': languages,
-    'langauge': langauge,
+    'language': language,
     'repo_name': 'docs',
     'jira_project': 'DOCS',
     'google_analytics': 'UA-7301842-8',
@@ -197,7 +197,7 @@
 epub_theme = 'epub_mongodb'
 epub_tocdup = True
 epub_tocdepth = 3
-epub_language = langauge
+epub_language = language
 epub_scheme = 'url'
 epub_identifier = 'http://docs.mongodb.org/' + meta['branch']
 epub_exclude_files = []