Minor text edits and a GM tip

Well, being I did all this in three hours last night, spelling and grammatical errors were eminent. Alas, they are addressed... I also added this tip:

GM Pro Play Suggestion: I recommend printing the rules and the character sheets front and back and laminating them, then give them out to your players along with a wet erase marker. This ensures you are not wasting paper on dying mice and it gives the rules to each player at your table. Once the funnel is over, players can transfer their surviving mouse to an official Mausritter Character Sheet.