[rubygems/rubygems] Only disallow FIXME/TODO for first word of gemspec description

7890c98 matched the start of each line, whereas this matches the start
of the entire string.

https://github.com/rubygems/rubygems/commit/432de7b819

lib/rubygems/specification_policy.rb

@@ -381,7 +381,7 @@ http://spdx.org/licenses or '#{Gem::Licenses::NONSTANDARD}' for a nonstandard li
   end
 
   LAZY = '"FIxxxXME" or "TOxxxDO"'.gsub(/xxx/, '')
-  LAZY_PATTERN = /^FI XME|^TO DO/x.freeze
+  LAZY_PATTERN = /\AFI XME|\ATO DO/x.freeze
   HOMEPAGE_URI_PATTERN = /\A[a-z][a-z\d+.-]*:/i.freeze
 
   def validate_lazy_metadata

test/rubygems/test_gem_specification.rb

@@ -2795,6 +2795,20 @@ duplicate dependency on c (>= 1.2.3, development), (~> 1.2) use:
       assert_nothing_raised do
         @a1.validate
       end
+
+      # Adding #{f} at the start of the second or later line should be fine.
+      @a1.description = "(some description)\n#{f}"
+
+      assert_nothing_raised do
+        @a1.validate
+      end
+
+      # Adding #{t} at the start of the second or later line should be fine.
+      @a1.description = "(some description)\n#{t}"
+
+      assert_nothing_raised do
+        @a1.validate
+      end
     end
   end