#7 Minor fixups for BoosterMusicBooks texts

[Anders Jonsson]

Noticed that there are a few typos and misses in some of the InfoPages for the lessons contained in the BoostermusicBooks.zip in pianobooster.

/BoosterMusicBooks1/Beginner Course/InfoPages/05-ChordOfFMajor_en.html:
"or the left hand" should be "on the left hand";
Hint section is also empty (Contains jus the words "If you"). Here one could reuse the one from lesson 02: "If you don't know the names of the notes on the score then turn on Show Note Names
from the PianoBooster Setup/Preferences menu."

/BoosterMusicBooks1/Beginner Course/InfoPages/06-DownAndUp_en.html
This seems copypasted from 03-UpAndDown, but not everything is changed.
"Use your thumb for C, your index finger for D, . . . ,
all the way down to your little finger for G."
should really be
"Use your thumb for C, your index finger for B, . . . ,
all the way down to your little finger for F."

/BoosterMusicBooks1/Booster Music/InfoPages/07-AmazingGrace_en.html
"seprately" should be "separately"

[Michael Gambacurta]

Here are the updated files. They would replace the files in the InfoPages.

[Michael Gambacurta]

Here are the updated files that would replace the ones in the .../Beginner Course/InfoPages/

[AlexL]

Fixed by https://github.com/captnfab/PianoBooster/commit/0d17589b2a411324ac3e3b618ccb23021f8a84f0
Thank you for bugreport.

[Louis B.]

fixed