SetRequiredDeep: Fix docs typo (#1121)

Co-authored-by: Som Shekhar Mukherjee <[email protected]>

Author: larrifax

source/set-required-deep.d.ts

@@ -25,12 +25,12 @@ type Foo = {
 }
 
 type SomeRequiredDeep = SetRequiredDeep<Foo, 'a' | `c.${number}.d`>;
-// type SomeRequiredDeep = {
+//=> {
 // 	a: number; // Is now required
 // 	b?: string;
-// 	c: {
-// 		d: number // Is now required
-// 	}[]
+// 	c?: {
+// 		d: number; // Is now required
+// 	}[];
 // }
 
 // Set specific indices in an array to be required.