Reset next specs

Author: eregon

.gitattributes

@@ -2,8 +2,6 @@
 
 /CHANGELOG.md merge=union
 
-/spec/truffleruby.next-specs merge=union
-
 # Rules for GitHub's Linguist language-classification system. We're abusing the
 # 'vendored' attribute to exclude files as a lot of this isn't really vendored,
 # and a whole lot of actually vendored code isn't listed! What we want to do is

doc/contributor/updating-ruby.md

@@ -162,7 +162,7 @@ Update all of these:
 
 For a new major version:
 * Update `TargetRubyVersion` in `.rubocop.yml`
-* Update the list of `:next` specs.
+* Update `spec/truffleruby.next-specs` and remove `/spec/truffleruby.next-specs merge=union` in `.gitattributes`
 * Update the docs for next version specs in [workflow.md](workflow.md).
 * Update the versions in the `ruby/spec on CRuby` job of `.github/workflows/ci.yml`.