Fixed a couple of typos in comments

fixes #272

github/github.go

@@ -236,7 +236,7 @@ func newResponse(r *http.Response) *Response {
 }
 
 // populatePageValues parses the HTTP Link response headers and populates the
-// various pagination link values in the Reponse.
+// various pagination link values in the Response.
 func (r *Response) populatePageValues() {
 	if links, ok := r.Response.Header["Link"]; ok && len(links) > 0 {
 		for _, link := range strings.Split(links[0], ",") {

github/github_test.go

@@ -55,7 +55,7 @@ func teardown() {
 // openTestFile creates a new file with the given name and content for testing.
 // In order to ensure the exact file name, this function will create a new temp
 // directory, and create the file in that directory.  It is the caller's
-// responsibility to remove the directy and its contents when no longer needed.
+// responsibility to remove the directory and its contents when no longer needed.
 func openTestFile(name, content string) (file *os.File, dir string, err error) {
 	dir, err = ioutil.TempDir("", "go-github")
 	if err != nil {

github/repos_stats.go

@@ -102,7 +102,7 @@ func (s *RepositoriesService) ListCommitActivity(owner, repo string) ([]WeeklyCo
 
 // ListCodeFrequency returns a weekly aggregate of the number of additions and
 // deletions pushed to a repository.  Returned WeeklyStats will contain
-// additiona and deletions, but not total commits.
+// additions and deletions, but not total commits.
 //
 // GitHub API Docs: https://developer.github.com/v3/repos/statistics/#code-frequency
 func (s *RepositoriesService) ListCodeFrequency(owner, repo string) ([]WeeklyStats, *Response, error) {
@@ -175,7 +175,7 @@ func (s *RepositoriesService) ListParticipation(owner, repo string) (*Repository
 	return participation, resp, err
 }
 
-// PunchCard respresents the number of commits made during a given hour of a
+// PunchCard represents the number of commits made during a given hour of a
 // day of thew eek.
 type PunchCard struct {
 	Day     *int // Day of the week (0-6: =Sunday - Saturday).

github/repos_statuses.go

@@ -86,7 +86,7 @@ func (s *RepositoriesService) CreateStatus(owner, repo, ref string, status *Repo
 // CombinedStatus represents the combined status of a repository at a particular reference.
 type CombinedStatus struct {
 	// State is the combined state of the repository.  Possible values are:
-	// failture, pending, or success.
+	// failure, pending, or success.
 	State *string `json:"state,omitempty"`
 
 	Name       *string      `json:"name,omitempty"`