Fix for #2677 (#2705)

* Update docs given https://github.com/yaml/go-yaml/pull/348

* Fix for https://github.com/mikefarah/yq/issues/2677

Depends on https://github.com/yaml/go-yaml/pull/348

* Test for https://github.com/mikefarah/yq/issues/2677

* Remove redundant check and add test case for explicit `!!merge` on `*+` traversal

* Bump go.yaml.in/yaml/v4 from 4.0.0-rc.4 to 4.0.0-rc.5

pkg/yqlib/doc/operators/multiply-merge.md

@@ -471,13 +471,13 @@ bar: &bar
   c: bar_c
 foobarList:
   b: foobarList_b
-  !!merge <<:
+  <<:
     - *foo
     - *bar
   c: foobarList_c
 foobar:
   c: foobar_c
-  !!merge <<: *foo
+  <<: *foo
   thing: foobar_thing
 ```
 then
@@ -487,7 +487,7 @@ yq '.foobar * .foobarList' sample.yml
 will output
 ```yaml
 c: foobarList_c
-!!merge <<:
+<<:
   - *foo
   - *bar
 thing: foobar_thing