Fix trivial typo in docs of RequestExt (#525)

Co-authored-by: Simon Gasse <[email protected]>

Author: sgasse

lambda-http/src/ext.rs

@@ -162,7 +162,7 @@ pub trait RequestExt {
     where
         V: Into<QueryMap>;
 
-    /// Return request context data assocaited with the ALB or API gateway request
+    /// Return request context data associated with the ALB or API gateway request
     fn request_context(&self) -> RequestContext;
 
     /// Configures instance with request context