Merge pull request #7690 from stomar/fix-typo-build-checksum

Fix typo in description of build:checksum task

(cherry picked from commit 7dddd65)

Author: simi

bundler/lib/bundler/gem_helper.rb

@@ -47,7 +47,7 @@ def install
         built_gem_path = build_gem
       end
 
-      desc "Generate SHA512 checksum if #{name}-#{version}.gem into the checksums directory."
+      desc "Generate SHA512 checksum of #{name}-#{version}.gem into the checksums directory."
       task "build:checksum" => "build" do
         build_checksum(built_gem_path)
       end