Move sentence about replacing of notes in entry mode to a later Step

Step 1: „Note entry in MuseScore replaces the existing notes or rests in a measure with your new notes (i.e. overwrites rather than inserts).“

→ this should be at the beginning of Section „Step 4: Enter Pitch“

Further explanation:
At Step 1 the reader did not yet try to enter N to enter "note entry mode". The reader should read this information, when he learns to press the N button.