Fix various documentation, user-facing, and source comment typos (#16367)

* Fix various doc, user-facing, and source comment typos

Found via `codespell -q 3 -S ./options/locale,./vendor -L ba,pullrequest,pullrequests,readby`

modules/migrations/base/downloader.go

@@ -18,7 +18,7 @@ type GetCommentOptions struct {
 	PageSize    int
 }
 
-// Downloader downloads the site repo informations
+// Downloader downloads the site repo information
 type Downloader interface {
 	SetContext(context.Context)
 	GetRepoInfo() (*Repository, error)

modules/migrations/base/label.go

@@ -5,7 +5,7 @@
 
 package base
 
-// Label defines a standard label informations
+// Label defines a standard label information
 type Label struct {
 	Name        string
 	Color       string

modules/migrations/base/uploader.go

@@ -5,7 +5,7 @@
 
 package base
 
-// Uploader uploads all the informations of one repository
+// Uploader uploads all the information of one repository
 type Uploader interface {
 	MaxBatchInsertSize(tp string) int
 	CreateRepo(repo *Repository, opts MigrateOptions) error