Update docs

Author: mobily

docs/api/components/columns.mdx

@@ -314,7 +314,7 @@ render(<App />)
 
 ### markAsColumn
 
-Use this function to wrap your custom `Column` component.
+Use this function to mark your custom component as `Column` (required due to an internal implementation of `Stacks`).
 
 ```jsx
 import { markAsColumn } from '@mobily/stacks'

docs/api/components/rows.mdx

@@ -402,7 +402,7 @@ render(<App />)
 
 ### markAsRow
 
-Use this function to wrap your custom `Row` component.
+Use this function to mark your custom component as `Row` (required due to an internal implementation of `Stacks`).
 
 ```jsx
 import { markAsRow } from '@mobily/stacks'