Update README.md

Co-authored-by: Radon Rosborough <radon.neon@gmail.com>

README.md

@@ -2357,7 +2357,7 @@ following things:
   well. In this case, the quote is *not* included in the recipe, as
   `straight-recipes-NAME-retrieve` would make use of `read`, which
   will return the literal Lisp object. For example, considering the
-  following retreival function:
+  following retrieval function:
 
         (defun straight-recipes-example-retrieve (name)
           (with-temp-buffer