Merged requested to merge CFD-Xing/nektar:fix/typo-time-integration into master
Just fixing some typo and remove some unused functions.
[ ] Functions and classes, or changes to them, are documented. [ ] User guide/documentation is updated.
Changelog is updated. [ ] Suitable tests added for new functionality.
Contributed code is correctly formatted. (See the contributing guidelines). [ ] License added to any new files. [ ] No extraneous files have been added (e.g. compiler output or test data files).