https://git.ruby-lang.org/ruby.git/commit/?id=0e02c3b7c2

From 0e02c3b7c246ca3d6fca10654431f9811b5aeaa0 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 5 Apr 2020 21:20:51 +0900
Subject: [Doc] Exclude bundler vendored libraries directory

The document in these external libraries may not be written in
RDoc, ignore the whole directory.

diff --git a/lib/.document b/lib/.document
index 04474f2..6681520 100644
--- a/lib/.document
+++ b/lib/.document
@@ -2,9 +2,7 @@ https://github.com/ruby/ruby/blob/trunk/lib/.document#L2
 
 *.rb
 
-bundler/[^v]*
-bundler/version*
-
+bundler
 cgi
 csv
 drb
diff --git a/lib/bundler/vendor/.document b/lib/bundler/vendor/.document
new file mode 100644
index 0000000..a5d5e46
--- /dev/null
+++ b/lib/bundler/vendor/.document
@@ -0,0 +1 @@
+# Ignore vendored libraries, which are not RDoc.
-- 
cgit v0.10.2


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