fix: correct a typo

"rest if chapters" -> "rest of chapters"

src/tools/intro.md

@@ -1,6 +1,6 @@
 # Tooling
 
-Radare2 is not just the only tool provided by the radare2 project. The rest if chapters in this book are focused on explaining the use of the radare2 tool, this chapter will focus on explaining all the other companion tools that are shipped inside the radare2 project.
+Radare2 is not just the only tool provided by the radare2 project. The rest of chapters in this book are focused on explaining the use of the radare2 tool, this chapter will focus on explaining all the other companion tools that are shipped inside the radare2 project.
 
 All the functionalities provided by the different APIs and plugins have also different tools to allow to use them from the commandline and integrate them with shellscripts easily.