docs: add more docs about before request

Author: sansyrox

docs_src/src/pages/documentation/en/api_reference/middlewares.mdx

@@ -126,7 +126,7 @@ Batman was excited to learn that he could add events as functions as well as dec
 
 ## What's next?
 
-Robyn - Great, you're now familiar with the certain advanced concepts of Robyn. Middlewares serve the base of 
+Robyn - Great, you're now familiar with the certain advanced concepts of Robyn.
 
 Batman - "Authentication! I want to learn about authentication. I want to make sure that only the right people can access my application."