Revert "docs: add more examples for prefer-object-spread (eslint#15831)"

This reverts commit 4c76ec7.

docs/src/rules/prefer-object-spread.md

@@ -20,15 +20,17 @@ Examples of **incorrect** code for this rule:
 ```js
 /*eslint prefer-object-spread: "error"*/
 
-Object.assign({}, foo);
+Object.assign({}, foo)
 
-Object.assign({}, {foo: 'bar'});
+Object.assign({}, {foo: 'bar'})
 
-Object.assign({ foo: 'bar'}, baz);
+Object.assign({ foo: 'bar'}, baz)
 
-Object.assign({}, baz, { foo: 'bar' });
+Object.assign({ foo: 'bar' }, Object.assign({ bar: 'foo' }))
 
-Object.assign({}, { ...baz });
+Object.assign({}, { foo, bar, baz })
+
+Object.assign({}, { ...baz })
 
 // Object.assign with a single argument that is an object literal
 Object.assign({});
@@ -41,16 +43,14 @@ Examples of **correct** code for this rule:
 ```js
 /*eslint prefer-object-spread: "error"*/
 
-({ ...foo });
-
-({ ...baz, foo: 'bar' });
+Object.assign(...foo);
 
 // Any Object.assign call without an object literal as the first argument
 Object.assign(foo, { bar: baz });
 
-Object.assign(foo, bar);
+Object.assign(foo, Object.assign(bar));
 
-Object.assign(foo, { bar, baz });
+Object.assign(foo, { bar, baz })
 
 Object.assign(foo, { ...baz });
 ```