Fixes grammar and style

[nikoandpiko]

Grammar issues are of most importance here. If anything needs updating, I would suggest those.

[cristianMuntean1]

Create a branch

  #
  # @param repo [Integer, String, Repository, Hash] A GitHub repository
  # @param branch [String] The branch name, e.g. <tt>feature/branchA</tt>
  # @param sha [String] A SHA, e.g. e.g. <tt>827efc6d56897b048c772eb4087f854f46256132</tt>
  # @return [Array<Sawyer::Resource>] The list of references, already containing the new one
  # @see https://developer.github.com/v3/git/refs/#create-a-reference
  # @example Create branch feature/branchA (refs/heads/feature/branchA) for octocat/Hello-World with sha 827efc6d56897b048c772eb4087f854f46256132
  #   Octokit.create_branch("octocat/Hello-World", "feature/branchA", "827efc6d56897b048c772eb4087f854f46256132")
  def create_branch(repo, branch, sha, options = {})
    branch = "heads/#{branch}" unless branch =~ %r{heads/}
    create_ref repo, branch, sha, options
  end

  describe ".create_branch" do 
       it "prepends heads/ to the branch parameter" do 
       request = stub_post(""/repos/#{@test_repo}/git/refs"").
         (:body => {ref: "refs/heads/testing/test-ref-2", sha: @first_sha}.to_json)
  @client.create_branch(@test_repo, "testing/test-ref-2", @first_sha)
  assert_requested request
end

it "does not duplicate heads/ in branch parameter" do
  request = stub_post("/repos/#{@test_repo}/git/refs").
    (:body => {ref: "refs/heads/testing/test-ref-2", sha: @first_sha}.to_json)
  @client.create_branch(@test_repo, "heads/testing/test-ref-2", @first_sha)
  assert_requested request
end

end # .create_branch

context "with ref", :vcr do
before(:each) do
commits = @client.commits(@test_repo)
@@ -64,6 +80,12 @@
end
end # .create_ref

describe ".create_branch" do
  it "creates a branch" do
    assert_requested :post, github_url("/repos/#{@test_repo}/git/refs")
  end
end # .create_branch

describe ".update_branch" do
  it "updates a branch" do
    @client.update_branch(@test_repo, "testing/test-ref", @last_sha, true)

[nickfloyd]

Thank you for making these changes ❤️ . Just one small nit but definitely not a blocker.