vim: fix broken link in comment

Closes Homebrew/homebrew#46148.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Formula/vim.rb

@@ -96,7 +96,7 @@ class Vim < Formula
     system "make"
     # If stripping the binaries is enabled, vim will segfault with
     # statically-linked interpreters like ruby
-    # http://code.google.com/p/vim/issues/detail?id=114&thanks=114&ts=1361483471
+    # https://github.com/vim/vim/issues/114
     system "make", "install", "prefix=#{prefix}", "STRIP=true"
     bin.install_symlink "vim" => "vi" if build.include? "override-system-vi"
   end