Add Wall of Browser Bugs entry for #20161 (#20183)

Refs https://bugzilla.mozilla.org/show_bug.cgi?id=1282363

docs/_data/browser-bugs.yml

@@ -158,6 +158,16 @@
   origin: >
     Bootstrap#20143
 
+-
+  browser: >
+    Firefox
+  summary: >
+    `position: absolute` element that's wider than its column renders differently than other browsers
+  upstream_bug: >
+    Mozilla#1282363
+  origin: >
+    Bootstrap#20161
+
 -
   browser: >
     Firefox (Windows)