Apply suggestions from code review

Co-authored-by: Romain Tartière <romain@blogreen.org>

Author: jplindquist

README.md

@@ -687,7 +687,7 @@ vcsrepo { '/path/to/repo':
 vcsrepo { '/path/to/repo':
   ensure   => present,
   provider => git,
-  source   => 'http://svnrepo/hello/trunk',
+  source   => 'git@example.com:project.git',
   includes => [
     'root-file.txt',
     'checkout-folder',

lib/puppet/provider/vcsrepo/git.rb

@@ -96,8 +96,8 @@ def includes
     return nil if bare_exists?
 
     at_path do
-      return nil unless File.file?(File.join(@resource.value(:path), '.git/info/sparse-checkout'))
-      File.readlines(File.join(@resource.value(:path), '.git/info/sparse-checkout')).map(&:chomp)
+      return nil unless File.file?('.git/info/sparse-checkout')
+      File.readlines('.git/info/sparse-checkout').map(&:chomp)
     end
   end
 
@@ -438,7 +438,7 @@ def configure_sparse_checkout
         exec_git('config', '--local', '--bool', 'core.sparseCheckout', 'true')
 
         # Includes may be an Array or a String
-        File.open(File.join(@resource.value(:path), '.git/info/sparse-checkout'), 'w') do |f|
+        File.open('.git/info/sparse-checkout', 'w') do |f|
           if @resource.value(:includes).respond_to?(:each)
             @resource.value(:includes).each { |inc| f.puts inc }
           else