Fix spelling mistakes found by lintian.

cmd/cmd.go

@@ -46,9 +46,9 @@ upgrade individual packages, take snapshots and publish them
 back as Debian repositories.
 
 aptly's goal is to establish repeatability and controlled changes
-in a package-centric environment. aptly allows to fix a set of packages
+in a package-centric environment. aptly allows one to fix a set of packages
 in a repository, so that package installation and upgrade becomes
-deterministic. At the same time aptly allows to perform controlled,
+deterministic. At the same time aptly allows one to perform controlled,
 fine-grained changes in repository contents to transition your
 package environment to new version.`,
 		Flag: *flag.NewFlagSet("aptly", flag.ExitOnError),

cmd/mirror_edit.go

@@ -59,7 +59,7 @@ func makeCmdMirrorEdit() *commander.Command {
 		UsageLine: "edit <name>",
 		Short:     "edit properties of mirorr",
 		Long: `
-Command edit allows to change settings of mirror:
+Command edit allows one to change settings of mirror:
 filters, list of architectures.
 
 Example:

cmd/repo_edit.go

@@ -50,7 +50,7 @@ func makeCmdRepoEdit() *commander.Command {
 		UsageLine: "edit <name>",
 		Short:     "edit properties of local repository",
 		Long: `
-Command edit allows to change metadata of local repository:
+Command edit allows one to change metadata of local repository:
 comment, default distribution and component.
 
 Example: