Miscellaneous fixes

This commit attempts to fix some spelling and grammar issues for player output throughout the plugin. For example, "No fired found (...)" has been changed to "No fires found (...)".

Any documentation that had nonexistent parameters has been corrected.

PS: Quick note about the changes to `HelpCommand.java`:
These changes make all command descriptions more consistent, i.e.:
`/prism i - Toggle the inspector wand ; /prism (l|lookup) (params) - Search the database` instead of `/prism i - Toggles the inspector wand ; /prism (l|lookup) (params) - Search the database`. The aim is to make the command description seem more like *what can you do with this command?* as opposed to *what does Prism do when you enter this command?*

Two missing commands (`tp` and `undo`) have been added to the list, and the changes in #35 have also been applied to the rollback and restore wand.