Update 2.7 doc templates for 3.7.0 (GH-7996)

diff --git a/Doc/tools/static/switchers.js b/Doc/tools/static/switchers.js
index 8e0c5ea..2c051eb 100644
--- a/Doc/tools/static/switchers.js
+++ b/Doc/tools/static/switchers.js
@@ -11,7 +11,7 @@
 
   var all_versions = {
     '3.8': 'dev (3.8)',
-    '3.7': 'pre (3.7)',
+    '3.7': '3.7',
     '3.6': '3.6',
     '3.5': '3.5',
     '2.7': '2.7',