Add Wall of Browser Bugs entry for #16988

Refs http://wkbug.com/148061
Refs http://openradar.me/22299624
Closes #16988
[skip sauce]

docs/_data/browser-bugs.yml

@@ -250,6 +250,16 @@
   origin: >
     Bootstrap#14708
 
+-
+  browser: >
+    Safari (iOS)
+  summary: >
+    Can't move cursor to start of text after entering long string of text into `<input type="text">`
+  upstream_bug: >
+    WebKit#148061, Safari#22299624
+  origin: >
+    Bootstrap#16988
+
 -
   browser: >
     Safari (iOS)