Add Wall of Browser Bugs entry for #17695 (#20025)

See https://webkit.org/b/158342
Refs #17695.

[skip sauce]

docs/_data/browser-bugs.yml

@@ -370,6 +370,16 @@
   origin: >
     Bootstrap#19927
 
+-
+  browser: >
+    Safari (iOS)
+  summary: >
+    Modal with `-webkit-overflow-scrolling: touch` doesn't become scrollable after added text makes it taller
+  upstream_bug: >
+    WebKit#158342
+  origin: >
+    Bootstrap#17695
+
 -
   browser: >
     Safari (iPad Pro)