Improve README

Author: Thomas Stromberg

README.md

@@ -10,7 +10,7 @@
 
 Stupid fast in-memory Go cache with optional L2 persistence layer.
 
-Designed to persistently caching API requests in an unreliable environment, this cache has something for everyone.
+Designed for persistently caching API requests in an unreliable environment, this cache has something for everyone.
 
 ## Features
 
@@ -35,7 +35,7 @@ import "github.com/codeGROOVE-dev/sfcache"
 
 // strings as keys, ints as values
 cache := sfcache.Memory[string, int]()
-cache.Set("answer", 42, 0)
+cache.Set("answer", 42)
 val, found := cache.Get("answer")
 ```
 
@@ -50,8 +50,8 @@ import (
 p, _ := localfs.New[string, User]("myapp", "")
 cache, _ := sfcache.Persistent[string, User](ctx, p)
 
-cache.SetAsync(ctx, "user:123", user, 0) // Don't wait for the key to persist
-cache.Store.Len(ctx)                      // Access persistence layer directly
+cache.SetAsync(ctx, "user:123", user) // Don't wait for the key to persist
+cache.Store.Len(ctx)                  // Access persistence layer directly
 ```
 
 A persistent cache suitable for Cloud Run or local development; uses Cloud Datastore if available