Port twbs#20315 to v3

Add position:sticky to Most Wanted features (twbs#20315)

[skip sauce]

Author: cvrebert

docs/_data/browser-features.yml

@@ -8,6 +8,16 @@
   origin: >
     Bootstrap#19984
 
+-
+  browser: >
+    Microsoft Edge
+  summary: >
+    Implement [sticky positioning](http://html5please.com/#position:sticky) from CSS Positioned Layout Level 3
+  upstream_bug: >
+    UserVoice#6263621
+  origin: >
+    Bootstrap#17021
+
 -
   browser: >
     Firefox
@@ -58,6 +68,16 @@
   origin: >
     Bootstrap#19984
 
+-
+  browser: >
+    Chrome
+  summary: >
+    Implement [sticky positioning](http://html5please.com/#position:sticky) from CSS Positioned Layout Level 3
+  upstream_bug: >
+    Chromium#231752
+  origin: >
+    Bootstrap#17021
+
 -
   browser: >
     Safari