CLDR-17113 kbd: no nested gestures

docs/ldml/tr35-keyboards.md

@@ -666,6 +666,8 @@ _Attribute:_ `longPressKeyIds="{list of key ids}"` (optional)
 >
 > In a list of keys specified by `longPressKeyIds`, the key matching `longPressDefaultKeyId` attribute (if present) specifies the default long-press target, which could be different than the first element. It is an error if the `longPressDefaultKeyId` key is not in the `longPressKeyIds` list.
 >
+> Gestures are not nested: other gestures (such as flick, multiTap, longPress) are ignored on the keys in the `longPressKeyIds` list.
+>
 > For example, if the default key is a key whose [display](#Element_displays) value is `{`, an implementation might render the key as follows:
 >
 > ![keycap hint](images/keycapHint.png)
@@ -696,6 +698,8 @@ _Attribute:_ `multiTapKeyIds` (optional)
 > A space-separated ordered list of `key` element ids, which keys, where each successive key in the list is produced by the corresponding number of quick taps.
 > It is an error for a key to reference itself in the `multiTapKeyIds` list.
 >
+> Gestures are not nested: other gestures (such as flick, multiTap, longPress) are ignored on the keys in the `multiTapKeyIds` list.
+>
 > _Example:_
 > - first tap on the key will produce “a”
 > - two taps will produce “bb”
@@ -925,6 +929,9 @@ _Attribute:_ `directions` (required)
 _Attribute:_ `keyId` (required)
 
 > The `keyId` attribute value is the result of (one or more) flicks.
+>
+> Gestures are not nested: other gestures (such as flick, multiTap, longPress) are ignored on the key referenced by `keyId`.
+
 
 **Example**
 where a flick to the Northeast then South produces `Å`.