[mantine.dev] TimePicker fix wording

Author: rtivital

apps/mantine.dev/src/pages/dates/time-picker.mdx

@@ -14,7 +14,7 @@ more.
 
 ## Controlled
 
-`TimePicker` component value is a string in `hh:mm:ss` 24-hour format (for example `18:34:55`).
+`TimePicker` component value is a string in `hh:mm:ss` or `hh:mm` 24-hour format (for example `18:34:55`, `18:34`).
 Empty string is used to represent no value. `onChange` function is called only when the entered value is valid.
 The input value is considered valid in the following cases: