feat(docs): Improved QInput example to prevent issue #11423 #10376 #1…

…0362 #12431 (#12432)

* fix(docs): Improved QInput example...

...to prevent issue duplicating

Related: [#11423, [#10376, [#10362 [#12431.

* Update input.md

Co-authored-by: Razvan Stoenescu <razvan.stoenescu@gmail.com>

docs/src/pages/vue-components/input.md

@@ -74,6 +74,10 @@ Please check these resources for more information about native attributes (for i
 
 As a helper, you can use `clearable` prop so user can reset model to `null` through an appended icon. The second QInput in the example below is the equivalent of using `clearable`.
 
+::: warning
+Won't work with `v-model` managed input modifiers such as `.trim` because in that case Vue doesn't handle `null` values.
+:::
+
 <doc-example title="Clearable" file="QInput/Clearable" />
 
 ### Input types