Fix reference to tempest_lib

Trivial-Fix

Change-Id: I413c17bdada2208321c055812c255f5b7fd0d51b
diff --git a/tempest/api/identity/v3/test_projects.py b/tempest/api/identity/v3/test_projects.py
index 995b77e..1574ab7 100644
--- a/tempest/api/identity/v3/test_projects.py
+++ b/tempest/api/identity/v3/test_projects.py
@@ -33,7 +33,7 @@
         # user can successfully authenticate using his credentials and
         # project name from received projects list
         for project in resp['projects']:
-            # 'user_domain_id' needs to be specified otherwise tempest_lib
+            # 'user_domain_id' needs to be specified otherwise tempest.lib
             # assumes it to be 'default'
             token_id, body = self.non_admin_token.get_token(
                 username=self.os.credentials.username,
diff --git a/tempest/api/identity/v3/test_tokens.py b/tempest/api/identity/v3/test_tokens.py
index 593bf2a..d5bed96 100644
--- a/tempest/api/identity/v3/test_tokens.py
+++ b/tempest/api/identity/v3/test_tokens.py
@@ -30,7 +30,7 @@
         password = creds.password
         user_domain_id = creds.user_domain_id
 
-        # 'user_domain_id' needs to be specified otherwise tempest_lib assumes
+        # 'user_domain_id' needs to be specified otherwise tempest.lib assumes
         # it to be 'default'
         token_id, resp = self.non_admin_token.get_token(
             user_id=user_id,