Fix link to 'learning to say no' in Bengali

Updated the link in the contribution guideline to point to the correct section in Bengali.

Author: STANTHEGR8

_articles/bn/building-community.md

@@ -35,7 +35,7 @@ Start with your documentation:
 * **When someone new lands on your project, thank them for their interest!** It only takes one negative experience to make someone not want to come back.
 * **Be responsive.** If you don't respond to their issue for a month, chances are, they've already forgotten about your project.
 * **Be open-minded about the types of contributions you'll accept.** Many contributors start with a bug report or a small fix. There are [many ways to contribute](../how-to-contribute/#what-it-means-to-contribute) to a project. Let people help how they want to help.
-* **If there's a contribution you disagree with,** thank them for their idea and [explain why](../best-practices/#learning-to-say-no) it doesn't fit into the scope of the project, linking to relevant documentation if you have it.
+* **If there's a contribution you disagree with,** thank them for their idea and [explain why](../best-practices/#না-বলতে-শেখা) it doesn't fit into the scope of the project, linking to relevant documentation if you have it.
 
 <aside markdown="1" class="pquote">
   <img src="https://avatars.githubusercontent.com/mikeal?s=180" class="pquote-avatar" alt="avatar">