Bump RDoc to 7.0.1 (#15628)

This improves several enhancements to the Aliki theme. And since Aliki
also became the default theme, we don't need to specify the generator name
anymore.

.rdoc_options

@@ -12,8 +12,6 @@ exclude:
 - \.gemspec\z
 - lib/set/subclass_compatible.rb
 
-generator_name: aliki
-
 autolink_excluded_words:
 - Box
 - Class

NEWS.md

@@ -269,7 +269,7 @@ The following bundled gems are promoted from default gems.
 * pstore 0.2.0
 * benchmark 0.5.0
 * logger 1.7.0
-* rdoc 6.17.0
+* rdoc 7.0.1
 * win32ole 1.9.2
 * irb 1.16.0
 * reline 0.6.3

gems/bundled_gems

@@ -39,7 +39,7 @@ ostruct             0.6.3   https://github.com/ruby/ostruct
 pstore              0.2.0   https://github.com/ruby/pstore
 benchmark           0.5.0   https://github.com/ruby/benchmark
 logger              1.7.0   https://github.com/ruby/logger
-rdoc                6.17.0  https://github.com/ruby/rdoc
+rdoc                7.0.1   https://github.com/ruby/rdoc
 win32ole            1.9.2   https://github.com/ruby/win32ole
 irb                 1.16.0  https://github.com/ruby/irb
 reline              0.6.3   https://github.com/ruby/reline