User:MF38

MFG38 but without the G (I still have no idea how that happened). On a grammatical mission to make the Doom Wiki slightly more readable. Also adding soundtrack information where it's lacking.

Soundtrack information completed for the following wads (listed chronologically):
 * Echelon
 * 3x3
 * 3x3: Take Two
 * Ar Luminae
 * Mutabor
 * Literalism
 * Doom 64 for Doom 2
 * Ashes 2063 + Dead Man Walking