Fix typos, improve help messages

Author: NeoTheThird

ubports-qa

@@ -15,7 +15,7 @@ class Status(Enum):
 def mount():
     subprocess.call(["mount", "-o", "rw,remount", "/"])
 
-def umount():
+def unmount():
     subprocess.call(["mount", "-o", "ro,remount", "/"])
 
 def apt_update():
@@ -100,25 +100,25 @@ def update(args):
     mount()
     apt_update()
     apt_upgrade()
-    umount()
+    unmount()
 
 parser = argparse.ArgumentParser(description='UBports QA scripts')
 subparsers = parser.add_subparsers(help='')
 
-parser_inst = subparsers.add_parser('install', help='Add pr to install')
-parser_inst.add_argument('repo', type=str, help='Repo')
-parser_inst.add_argument('pr', type=int, help='Pr id to install', nargs='?', default=-1)
-parser_inst.set_defaults(func=install)
+parser_install = subparsers.add_parser('install', help='Install a pull-request')
+parser_install.add_argument('repo', type=str, help='Name of the git repository')
+parser_install.add_argument('pr', type=int, help='Pull-request to install (numeric ID)', nargs='?', default=-1)
+parser_install.set_defaults(func=install)
 
-parser_rem = subparsers.add_parser('remove', help='Remove installed repo')
-parser_rem.add_argument('repo', type=str, help='Repo')
-parser_rem.set_defaults(func=remove)
+parser_remove = subparsers.add_parser('remove', help='Remove installed repository / branch')
+parser_remove.add_argument('repo', type=str, help='Name of the repository / branch')
+parser_remove.set_defaults(func=remove)
 
-parser_list = subparsers.add_parser('list', help='List installed repos')
+parser_list = subparsers.add_parser('list', help='List installed repositories / branches')
 parser_list.set_defaults(func=list)
 
-parser_up = subparsers.add_parser('update', help='Update system using apt')
-parser_up.set_defaults(func=update)
+parser_update = subparsers.add_parser('update', help='Update system using apt')
+parser_update.set_defaults(func=update)
 
 try:
     args = parser.parse_args()