MDL-50049 deprecation: Extra minor fixes.

- complete and cleanup upgrade.txt
- replace remaining uses in comments.
- fix some incorrect bulk-replacement in previous commit.

lib/upgrade.txt

@@ -20,8 +20,8 @@ information provided here is intended especially for developers.
     session_get_instance()
     session_is_legacy()
     session_kill_all()
-    session_touch($sid)
-    session_kill($sid)
+    session_touch()
+    session_kill()
     session_kill_user()
     session_set_user()
     session_is_loggedinas()
@@ -31,6 +31,7 @@ information provided here is intended especially for developers.
     css_minify_css()
     update_login_count()
     reset_login_count()
+    check_gd_version()
     update_log_display_entry()
     get_recent_enrolments()
     groups_filter_users_by_course_module_visible()
@@ -85,7 +86,7 @@ information provided here is intended especially for developers.
     get_parent_contexts()
     get_parent_contextid()
     get_child_contexts()
-    create_contexts(()
+    create_contexts()
     cleanup_contexts()
     build_context_path()
     rebuild_contexts()
@@ -111,6 +112,7 @@ information provided here is intended especially for developers.
     get_device_type_list()
     get_selected_theme_for_device_type()
     get_device_cfg_var_name()
+    set_user_device_type()
     get_user_device_type()
     get_browser_version_classes()
     generate_email_supportuser()