Updated local.file to change path to filename as per documentation (

#715) (#738)

(cherry picked from commit 8b9d3e8)

Co-authored-by: fanuch <[email protected]>

docs/sources/tutorials/first-components-and-stdlib/index.md

@@ -78,7 +78,7 @@ Look at the following simple pipeline:
 
 ```alloy
 local.file "example" {
-    path = env("HOME") + "file.txt"
+    filename = env("HOME") + "/file.txt"
 }
 
 prometheus.remote_write "local_prom" {