name a variable fqdn instead of domain, improve dotenv docstring

openappstack/__main__.py

@@ -288,13 +288,13 @@ def create(clus, args):  # pylint: disable=too-many-branches
                            'characters'), MAX_DOMAIN_LENGTH)
                 sys.exit(1)
 
-        domain = '{subdomain}.{domain}'.format(
+        fqdn = '{subdomain}.{domain}'.format(
             subdomain=subdomain, domain=args.domain)
     else:
-        domain = args.domain
+        fqdn = args.domain
         subdomain = None
 
-    clus.domain = domain
+    clus.domain = fqdn
 
     # Set acme_staging to False so we use Let's Encrypt's live environment
     if args.acme_staging:

openappstack/cluster.py

@@ -205,7 +205,7 @@ LOCAL_FLUX={local_flux}
 
     @property
     def dotenv_file(self):
-        """Path to the .env file that can be used by gitlab-ci"""
+        """Path to the .env file with relevant environment variables"""
         return os.path.join(self.cluster_dir, '.env')