Add ## at the top to render the message in BC

Author: daneshk

ballerina/Module.md

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 **Deprecation Notice:** This library is deprecated and will no longer be maintained or updated. Instead, it is recommended to use the [`ballerina/lang.regexp`](https://lib.ballerina.io/ballerina/lang.regexp/latest) library for continued support and updates. For more information, see the new [regexp types example](https://ballerina.io/by-example/regexp-type), [regexp operations example](https://ballerina.io/by-example/regexp-operations), and [regexp feature guide](https://ballerina.io/learn/distinctive-language-features/advanced-general-purpose-language-features/#regular-expressions).
 
 ## Overview

ballerina/Package.md

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 **Deprecation Notice:** This library is deprecated and will no longer be maintained or updated. Instead, it is recommended to use the [`ballerina/lang.regexp`](https://lib.ballerina.io/ballerina/lang.regexp/latest) library for continued support and updates. For more information, see the new [regexp types example](https://ballerina.io/by-example/regexp-type), [regexp operations example](https://ballerina.io/by-example/regexp-operations), and [regexp feature guide](https://ballerina.io/learn/distinctive-language-features/advanced-general-purpose-language-features/#regular-expressions).
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 ## Package overview
 
 This module provides APIs for searching, splitting, and replacing the set of characters of a string. These APIs are using a