[perceval] Fix installation link

Signed-off-by: inishchith <[email protected]>

Author: inishchith

perceval/intro.md

@@ -3,5 +3,5 @@
 [Perceval](https://github.com/chaoss/grimoirelab-perceval) is a Python module for retrieving data from repositories related to software development. It works with many data sources, from git repositories and GitHub projects to mailing lists, Gerrit or StackOverflow, In this chapter, you will learn the basics of working with Perceval, including how to use it to retrieve information from some kinds of repositories. You're on your way to software development analysis!
 
 Before starting, ensure that you have Python3 ready, and the Perceval module installed, as detailed in
-[Installing GrimoireLab Python modules](../basics/install.html).
+[Installing GrimoireLab Python modules](../basics/install.md).