Docs: Fix comments on struct index signature example (#1307)

Author: jsfeldman

content/src/content/docs/docs/schema/basic-usage.mdx

@@ -1409,8 +1409,8 @@ This can lead to unexpected TypeScript behavior.
 import { Schema } from "effect"
 
 // Attempting to define a struct with a conflicting index signature
-// - The fixed property "a" is a number
-// - The index signature requires all values to be strings
+// - The fixed property "a" is a string
+// - The index signature requires all values to be numbers
 const schema = Schema.Struct(
   { a: Schema.String },
   { key: Schema.String, value: Schema.Number }