chore(button): add known issue for tooltip/popover

* add known issue to button docs indicating a CSS issue when using a tooltip or a popover. Closes #5890
angular-ui · May 16, 2016 · aec5304 · aec5304
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commit aec5304
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diff --git a/src/buttons/docs/readme.md b/src/buttons/docs/readme.md
@@ -44,3 +44,7 @@ With the buttons directive, we can make a group of buttons behave like a set of
 * `toggleEvent`
   _(Default: `click`)_ -
   Event used to toggle the buttons.
+
+### Known issues
+
+To use tooltips or popovers on elements within a `btn-group`, set the tooltip/popover `appendToBody` option to `true`. This is due to Bootstrap CSS styling. See [here](http://getbootstrap.com/components/#btn-groups) for more information.